diff --git a/openslides/motions/forms.py b/openslides/motions/forms.py
index 432020a74..048480e79 100644
--- a/openslides/motions/forms.py
+++ b/openslides/motions/forms.py
@@ -104,7 +104,7 @@ class MotionSubmitterMixin(forms.ModelForm):
     def __init__(self, *args, **kwargs):
         """Fill in the submitter of the motion as default value."""
         if self.motion is not None:
-            submitter = [submitter.person.id for submitter in self.motion.submitter.all()]
+            submitter = self.motion.submitters.all()
             self.initial['submitter'] = submitter
         super(MotionSubmitterMixin, self).__init__(*args, **kwargs)
 
@@ -119,7 +119,7 @@ class MotionSupporterMixin(forms.ModelForm):
     def __init__(self, *args, **kwargs):
         """Fill in the supporter of the motions as default value."""
         if self.motion is not None:
-            supporter = [supporter.person.id for supporter in self.motion.supporter.all()]
+            supporter = self.motion.supporters.all()
             self.initial['supporter'] = supporter
         super(MotionSupporterMixin, self).__init__(*args, **kwargs)
 
diff --git a/openslides/motions/models.py b/openslides/motions/models.py
index bdc807308..80b109128 100644
--- a/openslides/motions/models.py
+++ b/openslides/motions/models.py
@@ -1,3 +1,4 @@
+from django.conf import settings
 from django.core.urlresolvers import reverse
 from django.db import models
 from django.db.models import Max
@@ -83,6 +84,16 @@ class Motion(RESTModelMixin, SlideMixin, AbsoluteUrlMixin, models.Model):
     Tags to categorise motions.
     """
 
+    submitters = models.ManyToManyField(settings.AUTH_USER_MODEL, related_name='motion_submitters')
+    """
+    Users who submit this motion.
+    """
+
+    supporters = models.ManyToManyField(settings.AUTH_USER_MODEL, related_name='motion_supporters')
+    """
+    Users who support this motion.
+    """
+
     class Meta:
         permissions = (
             ('can_see', ugettext_noop('Can see motions')),
@@ -378,55 +389,17 @@ class Motion(RESTModelMixin, SlideMixin, AbsoluteUrlMixin, models.Model):
         except IndexError:
             return self.get_new_version()
 
-    @property
-    def submitters(self):
-        return sorted([object.person for object in self.submitter.all()],
-                      key=lambda person: person.sort_name)
-
-    def is_submitter(self, person):
-        """Return True, if person is a submitter of this motion. Else: False."""
-        return self.submitter.filter(person=person.pk).exists()
-
-    @property
-    def supporters(self):
-        return [supporter.person for supporter in self.supporter.all()]
-
-    def add_submitter(self, person):
-        MotionSubmitter.objects.create(motion=self, person=person)
-
-    def clear_submitters(self):
-        MotionSubmitter.objects.filter(motion=self).delete()
-
-    def is_supporter(self, person):
+    def is_submitter(self, user):
         """
-        Return True, if person is a supporter of this motion. Else: False.
+        Returns True if user is a submitter of this motion, else False.
         """
-        return self.supporter.filter(person=person.pk).exists()
+        return user in self.submitters.all()
 
-    def support(self, person):
+    def is_supporter(self, user):
         """
-        Add 'person' as a supporter of this motion.
+        Returns True if user is a supporter of this motion, else False.
         """
-        if self.state.allow_support:
-            if not self.is_supporter(person):
-                MotionSupporter(motion=self, person=person).save()
-        else:
-            raise WorkflowError('You can not support a motion in state %s.' % self.state.name)
-
-    def unsupport(self, person):
-        """
-        Remove 'person' as supporter from this motion.
-        """
-        if self.state.allow_support:
-            self.supporter.filter(person=person).delete()
-        else:
-            raise WorkflowError('You can not unsupport a motion in state %s.' % self.state.name)
-
-    def clear_supporters(self):
-        """
-        Deletes all supporters of this motion.
-        """
-        MotionSupporter.objects.filter(motion=self).delete()
+        return user in self.supporters.all()
 
     def create_poll(self):
         """
@@ -443,6 +416,13 @@ class Motion(RESTModelMixin, SlideMixin, AbsoluteUrlMixin, models.Model):
         else:
             raise WorkflowError('You can not create a poll in state %s.' % self.state.name)
 
+    @property
+    def workflow(self):
+        """
+        Returns the id of the workflow of the motion.
+        """
+        return self.state.workflow.pk
+
     def set_state(self, state):
         """
         Set the state of the motion.
@@ -504,6 +484,7 @@ class Motion(RESTModelMixin, SlideMixin, AbsoluteUrlMixin, models.Model):
         * change_state
         * reset_state
         """
+        # TODO: Remove this method and implement these things in the views.
         actions = {
             'see': (person.has_perm('motions.can_see') and
                     (not self.state.required_permission_to_see or
@@ -619,46 +600,6 @@ class MotionVersion(RESTModelMixin, AbsoluteUrlMixin, models.Model):
         return self.motion
 
 
-class MotionSubmitter(RESTModelMixin, models.Model):
-    """Save the submitter of a Motion."""
-
-    motion = models.ForeignKey('Motion', related_name="submitter")
-    """The motion to witch the object belongs."""
-
-    person = models.ForeignKey(User)
-    """The user, who is the submitter."""
-
-    def __str__(self):
-        """Return the name of the submitter as string."""
-        return str(self.person)
-
-    def get_root_rest_element(self):
-        """
-        Returns the motion to this instance which is the root REST element.
-        """
-        return self.motion
-
-
-class MotionSupporter(RESTModelMixin, models.Model):
-    """Save the submitter of a Motion."""
-
-    motion = models.ForeignKey('Motion', related_name="supporter")
-    """The motion to witch the object belongs."""
-
-    person = models.ForeignKey(User)
-    """The person, who is the supporter."""
-
-    def __str__(self):
-        """Return the name of the supporter as string."""
-        return str(self.person)
-
-    def get_root_rest_element(self):
-        """
-        Returns the motion to this instance which is the root REST element.
-        """
-        return self.motion
-
-
 class Category(RESTModelMixin, AbsoluteUrlMixin, models.Model):
     name = models.CharField(max_length=255, verbose_name=ugettext_lazy("Category name"))
     """Name of the category."""
diff --git a/openslides/motions/pdf.py b/openslides/motions/pdf.py
index d7c930a6b..7b70bb250 100644
--- a/openslides/motions/pdf.py
+++ b/openslides/motions/pdf.py
@@ -49,7 +49,7 @@ def motion_to_pdf(pdf, motion):
                             stylesheet['Heading4']))
     cell1b = []
     cell1b.append(Spacer(0, 0.2 * cm))
-    for submitter in motion.submitter.all():
+    for submitter in motion.submitters.all():
         cell1b.append(Paragraph(str(submitter), stylesheet['Normal']))
     motion_data.append([cell1a, cell1b])
 
@@ -71,7 +71,7 @@ def motion_to_pdf(pdf, motion):
         cell3b = []
         cell3a.append(Paragraph("<font name='Ubuntu-Bold'>%s:</font><seqreset id='counter'>"
                                 % _("Supporters"), stylesheet['Heading4']))
-        supporters = motion.supporter.all()
+        supporters = motion.supporters.all()
         for supporter in supporters:
             cell3b.append(Paragraph("<seq id='counter'/>.&nbsp; %s" % str(supporter),
                                     stylesheet['Normal']))
diff --git a/openslides/motions/personal_info.py b/openslides/motions/personal_info.py
index 147acbfcf..8d7df7298 100644
--- a/openslides/motions/personal_info.py
+++ b/openslides/motions/personal_info.py
@@ -3,8 +3,6 @@ from django.utils.translation import ugettext_lazy
 from openslides.config.api import config
 from openslides.utils.personal_info import PersonalInfo
 
-from .models import Motion
-
 
 class MotionSubmitterPersonalInfo(PersonalInfo):
     """
@@ -14,7 +12,7 @@ class MotionSubmitterPersonalInfo(PersonalInfo):
     default_weight = 20
 
     def get_queryset(self):
-        return Motion.objects.filter(submitter__person=self.request.user)
+        return None  # TODO: Fix this after transforming everything using AngularJS.
 
 
 class MotionSupporterPersonalInfo(PersonalInfo):
@@ -26,7 +24,7 @@ class MotionSupporterPersonalInfo(PersonalInfo):
 
     def get_queryset(self):
         if config['motion_min_supporters']:
-            return_value = Motion.objects.filter(supporter__person=self.request.user)
+            return_value = None  # TODO: Fix this after transforming everything using AngularJS.
         else:
             return_value = None
         return return_value
diff --git a/openslides/motions/serializers.py b/openslides/motions/serializers.py
index d8566aedd..8802d1455 100644
--- a/openslides/motions/serializers.py
+++ b/openslides/motions/serializers.py
@@ -1,4 +1,13 @@
-from openslides.utils.rest_api import ModelSerializer, PrimaryKeyRelatedField, SerializerMethodField
+from django.db import transaction
+from django.utils.translation import ugettext as _
+
+from openslides.config.api import config
+from openslides.utils.rest_api import (
+    CharField,
+    IntegerField,
+    ModelSerializer,
+    PrimaryKeyRelatedField,
+    ValidationError,)
 
 from .models import (
     Category,
@@ -6,14 +15,20 @@ from .models import (
     MotionLog,
     MotionOption,
     MotionPoll,
-    MotionSubmitter,
-    MotionSupporter,
     MotionVersion,
     MotionVote,
     State,
     Workflow,)
 
 
+def validate_workflow_field(value):
+    """
+    Validator to ensure that the workflow with the given id exists.
+    """
+    if not Workflow.objects.filter(pk=value).exists():
+        raise ValidationError(_('Workflow %(pk)d does not exist.') % {'pk': value})
+
+
 class CategorySerializer(ModelSerializer):
     """
     Serializer for motion.models.Category objects.
@@ -56,24 +71,6 @@ class WorkflowSerializer(ModelSerializer):
         fields = ('id', 'name', 'state_set', 'first_state',)
 
 
-class MotionSubmitterSerializer(ModelSerializer):
-    """
-    Serializer for motion.models.MotionSubmitter objects.
-    """
-    class Meta:
-        model = MotionSubmitter
-        fields = ('person',)  # TODO: Rename this to 'user', see #1348
-
-
-class MotionSupporterSerializer(ModelSerializer):
-    """
-    Serializer for motion.models.MotionSupporter objects.
-    """
-    class Meta:
-        model = MotionSupporter
-        fields = ('person',)  # TODO: Rename this to 'user', see #1348
-
-
 class MotionLogSerializer(ModelSerializer):
     """
     Serializer for motion.models.MotionLog objects.
@@ -138,36 +135,94 @@ class MotionSerializer(ModelSerializer):
     """
     Serializer for motion.models.Motion objects.
     """
-    versions = MotionVersionSerializer(many=True, read_only=True)
     active_version = PrimaryKeyRelatedField(read_only=True)
-    submitter = MotionSubmitterSerializer(many=True, read_only=True)
-    supporter = MotionSupporterSerializer(many=True, read_only=True)
-    state = StateSerializer(read_only=True)
-    workflow = SerializerMethodField()
-    polls = MotionPollSerializer(many=True, read_only=True)
     log_messages = MotionLogSerializer(many=True, read_only=True)
+    polls = MotionPollSerializer(many=True, read_only=True)
+    reason = CharField(allow_blank=True, required=False, write_only=True)
+    state = StateSerializer(read_only=True)
+    text = CharField(write_only=True)
+    title = CharField(max_length=255, write_only=True)
+    versions = MotionVersionSerializer(many=True, read_only=True)
+    workflow = IntegerField(min_value=1, required=False, validators=[validate_workflow_field])
 
     class Meta:
         model = Motion
         fields = (
             'id',
             'identifier',
-            'identifier_number',
-            'parent',
-            'category',
-            'tags',
+            'title',
+            'text',
+            'reason',
             'versions',
             'active_version',
-            'submitter',
-            'supporter',
+            'parent',
+            'category',
+            'submitters',
+            'supporters',
             'state',
             'workflow',
+            'tags',
             'attachments',
             'polls',
             'log_messages',)
+        read_only_fields = ('parent',)  # Some other fields are also read_only. See definitions above.
 
-    def get_workflow(self, motion):
+    @transaction.atomic
+    def create(self, validated_data):
         """
-        Returns the id of the workflow of the motion.
+        Customized method to create a new motion from some data.
         """
-        return motion.state.workflow.pk
+        motion = Motion()
+        motion.title = validated_data['title']
+        motion.text = validated_data['text']
+        motion.reason = validated_data.get('reason', '')
+        motion.identifier = validated_data.get('identifier')
+        motion.category = validated_data.get('category')
+        motion.reset_state(validated_data.get('workflow', int(config['motion_workflow'])))
+        motion.save()
+        if validated_data['submitters']:
+            motion.submitters.add(*validated_data['submitters'])
+        else:
+            motion.submitters.add(validated_data['request_user'])
+        motion.supporters.add(*validated_data['supporters'])
+        motion.attachments.add(*validated_data['attachments'])
+        motion.tags.add(*validated_data['tags'])
+        return motion
+
+    @transaction.atomic
+    def update(self, motion, validated_data):
+        """
+        Customized method to update a motion.
+        """
+        # Identifier and category.
+        for key in ('identifier', 'category'):
+            if key in validated_data.keys():
+                setattr(motion, key, validated_data[key])
+
+        # Workflow.
+        workflow = validated_data.get('workflow')
+        if workflow is not None and workflow != motion.workflow:
+            motion.reset_state(workflow)
+
+        # Decide if a new version is saved to the database.
+        if (motion.state.versioning and
+                not validated_data.get('disable_versioning', False)):  # TODO
+            version = motion.get_new_version()
+        else:
+            version = motion.get_last_version()
+
+        # Title, text, reason.
+        for key in ('title', 'text', 'reason'):
+            if key in validated_data.keys():
+                setattr(version, key, validated_data[key])
+
+        motion.save(use_version=version)
+
+        # Submitters, supporters, attachments and tags
+        for key in ('submitters', 'supporters', 'attachments', 'tags'):
+            if key in validated_data.keys():
+                attr = getattr(motion, key)
+                attr.clear()
+                attr.add(*validated_data[key])
+
+        return motion
diff --git a/openslides/motions/templates/motions/motion_detail.html b/openslides/motions/templates/motions/motion_detail.html
index 52c0102fd..d71e01ecb 100644
--- a/openslides/motions/templates/motions/motion_detail.html
+++ b/openslides/motions/templates/motions/motion_detail.html
@@ -196,8 +196,8 @@
     <div class="well">
         <!-- Submitter -->
         <h5>{% trans "Submitter" %}:</h5>
-        {% for submitter in motion.submitter.all %}
-            <a href="{{ submitter.person|absolute_url }}">{{ submitter }}</a>{% if not forloop.last %}, {% endif %}
+        {% for submitter in motion.submitters.all %}
+            <a href="{{ submitter|absolute_url }}">{{ submitter }}</a>{% if not forloop.last %}, {% endif %}
         {% endfor %}
 
         <!-- Supporters -->
@@ -207,8 +207,8 @@
                 -
             {% else %}
                 <ol>
-                {% for supporter in motion.supporter.all %}
-                    <li><a href="{{ supporter.person|absolute_url }}">{{ supporter }}</a></li>
+                {% for supporter in motion.supporters.all %}
+                    <li><a href="{{ supporter|absolute_url }}">{{ supporter }}</a></li>
                 {% endfor %}
                 </ol>
             {% endif %}
diff --git a/openslides/motions/templates/motions/motion_list.html b/openslides/motions/templates/motions/motion_list.html
index 7135690b2..4eb6e0060 100644
--- a/openslides/motions/templates/motions/motion_list.html
+++ b/openslides/motions/templates/motions/motion_list.html
@@ -98,12 +98,12 @@
             <td class="optional">{% if motion.category %}{{ motion.category }}{% else %}–{% endif %}</td>
             <td class="optional-small"><span class="label label-info">{% trans motion.state.name %}</span></td>
             <td class="optional">
-                {% for submitter in motion.submitter.all %}
+                {% for submitter in motion.submitters.all %}
                     {{ submitter.person }}{% if not forloop.last %}, {% endif %}
                 {% endfor %}
             </td>
             {% if 'motion_min_supporters'|get_config > 0 %}
-                {% with supporters=motion.supporters|length %}
+                {% with supporters=motion.supporters.all|length %}
                     <td class="optional">
                     {% if supporters >= 'motion_min_supporters'|get_config %}
                         <a class="badge badge-success" rel="tooltip" data-original-title="{% trans 'Enough supporters' %}">{{ supporters }}</a>
diff --git a/openslides/motions/templates/motions/slide.html b/openslides/motions/templates/motions/slide.html
index afbbfa63e..ea3f9fe94 100644
--- a/openslides/motions/templates/motions/slide.html
+++ b/openslides/motions/templates/motions/slide.html
@@ -49,14 +49,14 @@
 
     <!-- Submitter -->
     <h4>{% trans "Submitter" %}:</h4>
-    {% for submitter in motion.submitter.all %}
+    {% for submitter in motion.submitters.all %}
         {{ submitter.person }}{% if not forloop.last %},<br>{% endif %}
     {% empty %}
         -
     {% endfor %}
 
     <!-- Supporters -->
-    {% with motion.supporter.all as supporters %}
+    {% with motion.supporters.all as supporters %}
     {% if supporters|length > 0 %}
         <h4>{% trans "Supporters" %}:</h4>
         {% for supporter in supporters %}
diff --git a/openslides/motions/templates/search/indexes/motions/motion_text.txt b/openslides/motions/templates/search/indexes/motions/motion_text.txt
index d6261e605..b27bd5d81 100644
--- a/openslides/motions/templates/search/indexes/motions/motion_text.txt
+++ b/openslides/motions/templates/search/indexes/motions/motion_text.txt
@@ -2,7 +2,7 @@
 {{ object.title }}
 {{ object.text }}
 {{ object.reason }}
-{{ object.submitters }}
-{{ object.supporters }}
+{{ object.submitters.all }}
+{{ object.supporters.all }}
 {{ object.category }}
 {{ object.tags.all }}
diff --git a/openslides/motions/views.py b/openslides/motions/views.py
index 003c830b6..915b92f96 100644
--- a/openslides/motions/views.py
+++ b/openslides/motions/views.py
@@ -1,12 +1,16 @@
+from django.http import Http404
 from django.utils.text import slugify
 from django.utils.translation import ugettext as _
+from django.utils.translation import ugettext_noop
 from django.shortcuts import get_object_or_404
 from reportlab.platypus import SimpleDocTemplate
+from rest_framework import status
 
-from openslides.utils.rest_api import ModelViewSet
+from openslides.config.api import config
+from openslides.utils.rest_api import ModelViewSet, Response, ValidationError, detail_route
 from openslides.utils.views import (PDFView, SingleObjectMixin)
 
-from .models import (Category, Motion, MotionPoll, Workflow)
+from .models import (Category, Motion, MotionPoll, MotionVersion, Workflow)
 from .pdf import motion_poll_to_pdf, motion_to_pdf, motions_to_pdf
 from .serializers import CategorySerializer, MotionSerializer, WorkflowSerializer
 
@@ -21,17 +25,216 @@ class MotionViewSet(ModelViewSet):
     def check_permissions(self, request):
         """
         Calls self.permission_denied() if the requesting user has not the
-        permission to see motions and in case of create, update or
-        destroy requests the permission to manage motions.
+        permission to see motions and in case of destroy requests the
+        permission to manage motions.
         """
-        # TODO: Use motions.can_create permission and
-        #       motions.can_support permission to create and update some
-        #       objects but restricted concerning the requesting user.
         if (not request.user.has_perm('motions.can_see') or
-                (self.action in ('create', 'update', 'destroy') and not
-                 request.user.has_perm('motions.can_manage'))):
+                (self.action == 'destroy' and not request.user.has_perm('motions.can_manage'))):
             self.permission_denied(request)
 
+    def create(self, request, *args, **kwargs):
+        """
+        Customized view endpoint to create a new motion.
+
+        Checks also whether the requesting user can submit a new motion. He
+        needs at least the permissions 'motions.can_see' (see
+        self.check_permission()) and 'motions.can_create'. If the
+        submitting of new motions by non-staff users is stopped via config
+        variable 'motion_stop_submitting', the requesting user needs also
+        to have the permission 'motions.can_manage'.
+        """
+        # Check permissions.
+        if (not request.user.has_perm('motions.can_create') or
+                (not config['motion_stop_submitting'] and
+                 not request.user.has_perm('motions.can_manage'))):
+            self.permission_denied(request)
+
+        # Check permission to send submitter and supporter data.
+        if (not request.user.has_perm('motions.can_manage') and
+                (request.data.getlist('submitters') or request.data.getlist('supporters'))):
+            # Non-staff users are not allowed to send submitter or supporter data.
+            self.permission_denied(request)
+
+        # Validate data and create motion.
+        serializer = self.get_serializer(data=request.data)
+        serializer.is_valid(raise_exception=True)
+        motion = serializer.save(request_user=request.user)
+
+        # Write the log message and initiate response.
+        motion.write_log([ugettext_noop('Motion created')], request.user)
+        headers = self.get_success_headers(serializer.data)
+        return Response(serializer.data, status=status.HTTP_201_CREATED, headers=headers)
+
+    def update(self, request, *args, **kwargs):
+        """
+        Customized view endpoint to update a motion.
+
+        Checks also whether the requesting user can update the motion. He
+        needs at least the permissions 'motions.can_see' (see
+        self.check_permission()). Also the instance method
+        get_allowed_actions() is evaluated.
+        """
+        # Get motion.
+        motion = self.get_object()
+
+        # Check permissions.
+        if not motion.get_allowed_actions(request.user)['update']:
+            self.permission_denied(request)
+
+        # Check permission to send submitter and supporter data.
+        if (not request.user.has_perm('motions.can_manage') and
+                (request.data.getlist('submitters') or request.data.getlist('supporters'))):
+            # Non-staff users are not allowed to send submitter or supporter data.
+            self.permission_denied(request)
+
+        # Validate data and update motion.
+        serializer = self.get_serializer(
+            motion,
+            data=request.data,
+            partial=kwargs.get('partial', False))
+        serializer.is_valid(raise_exception=True)
+        updated_motion = serializer.save()
+
+        # Write the log message, check removal of supporters and initiate response.
+        # TODO: Log if a version was updated.
+        updated_motion.write_log([ugettext_noop('Motion updated')], request.user)
+        if (config['motion_remove_supporters'] and updated_motion.state.allow_support and
+                not request.user.has_perm('motions.can_manage')):
+            updated_motion.supporters.clear()
+            updated_motion.write_log([ugettext_noop('All supporters removed')], request.user)
+        return Response(serializer.data)
+
+    @detail_route(methods=['put', 'delete'])
+    def manage_version(self, request, pk=None):
+        """
+        Special view endpoint to permit and delete a version of a motion.
+
+        Send PUT {'version_number': <number>} to permit and DELETE
+        {'version_number': <number>} to delete a version. Deleting the
+        active version is not allowed. Only managers can use this view.
+        """
+        # Check permission.
+        if not request.user.has_perm('motions.can_manage'):
+            self.permission_denied(request)
+
+        # Retrieve motion and version.
+        motion = self.get_object()
+        version_number = request.data.get('version_number')
+        try:
+            version = motion.versions.get(version_number=version_number)
+        except MotionVersion.DoesNotExist:
+            raise Http404('Version %s not found.' % version_number)
+
+        # Permit or delete version.
+        if request.method == 'PUT':
+            # Permit version.
+            motion.active_version = version
+            motion.save(update_fields=['active_version'])
+            motion.write_log(
+                message_list=[ugettext_noop('Version'),
+                              ' %d ' % version.version_number,
+                              ugettext_noop('permitted')],
+                person=self.request.user)
+            message = _('Version %d permitted successfully.') % version.version_number
+        else:
+            # Delete version.
+            # request.method == 'DELETE'
+            if version == motion.active_version:
+                raise ValidationError({'detail': _('You can not delete the active version of a motion.')})
+            version.delete()
+            motion.write_log(
+                message_list=[ugettext_noop('Version'),
+                              ' %d ' % version.version_number,
+                              ugettext_noop('deleted')],
+                person=self.request.user)
+            message = _('Version %d deleted successfully.') % version.version_number
+
+        # Initiate response.
+        return Response({'detail': message})
+
+    @detail_route(methods=['post', 'delete'])
+    def support(self, request, pk=None):
+        """
+        Special view endpoint to support a motion or withdraw support
+        (unsupport).
+
+        Send POST to support and DELETE to unsupport.
+
+        Checks also whether the requesting user can do this. He needs at
+        least the permissions 'motions.can_see' (see
+        self.check_permission()). Also the the permission
+        'motions.can_support' is required and the instance method
+        get_allowed_actions() is evaluated.
+        """
+        # Check permission.
+        if not request.user.has_perm('motions.can_support'):
+            self.permission_denied(request)
+
+        # Retrieve motion and allowed actions.
+        motion = self.get_object()
+        allowed_actions = motion.get_allowed_actions(request.user)
+
+        # Support or unsupport motion.
+        if request.method == 'POST':
+            # Support motion.
+            if not allowed_actions['support']:
+                raise ValidationError({'detail': _('You can not support this motion.')})
+            motion.supporters.add(request.user)
+            motion.write_log([ugettext_noop('Motion supported')], request.user)
+            message = _('You have supported this motion successfully.')
+        else:
+            # Unsupport motion.
+            # request.method == 'DELETE'
+            if not allowed_actions['unsupport']:
+                raise ValidationError({'detail': _('You can not unsupport this motion.')})
+            motion.supporters.remove(request.user)
+            motion.write_log([ugettext_noop('Motion unsupported')], request.user)
+            message = _('You have unsupported this motion successfully.')
+
+        # Initiate response.
+        return Response({'detail': message})
+
+    @detail_route(methods=['put'])
+    def set_state(self, request, pk=None):
+        """
+        Special view endpoint to set and reset a state of a motion.
+
+        Send PUT {'state': <state_id>} to set and just PUT {} to reset the
+        state. Only managers can use this view.
+        """
+        # Check permission.
+        if not request.user.has_perm('motions.can_manage'):
+            self.permission_denied(request)
+
+        # Retrieve motion and state.
+        motion = self.get_object()
+        state = request.data.get('state')
+
+        # Set or reset state.
+        if state is not None:
+            # Check data and set state.
+            try:
+                state_id = int(state)
+            except ValueError:
+                raise ValidationError({'detail': _('Invalid data. State must be an integer.')})
+            if state_id not in [item.id for item in motion.state.next_states.all()]:
+                raise ValidationError(
+                    {'detail': _('You can not set the state to %(state_id)d.') % {'state_id': state_id}})
+            motion.set_state(state_id)
+        else:
+            # Reset state.
+            motion.reset_state()
+
+        # Save motion.
+        motion.save(update_fields=['state', 'identifier'])
+        message = _('The state of the motion was set to %s.') % motion.state.name
+
+        # Write the log message and initiate response.
+        motion.write_log(
+            message_list=[ugettext_noop('State set to'), ' ', motion.state.name],
+            person=request.user)
+        return Response({'detail': message})
+
 
 class PollMixin(object):
     """
diff --git a/openslides/utils/rest_api.py b/openslides/utils/rest_api.py
index 53aad5b4a..cb24813c0 100644
--- a/openslides/utils/rest_api.py
+++ b/openslides/utils/rest_api.py
@@ -6,6 +6,7 @@ from django.core.urlresolvers import reverse
 from rest_framework.decorators import detail_route  # noqa
 from rest_framework.serializers import (  # noqa
     CharField,
+    IntegerField,
     ListSerializer,
     ModelSerializer,
     PrimaryKeyRelatedField,
diff --git a/tests/integration/motions/test_viewset.py b/tests/integration/motions/test_viewset.py
new file mode 100644
index 000000000..78b515439
--- /dev/null
+++ b/tests/integration/motions/test_viewset.py
@@ -0,0 +1,294 @@
+from django.contrib.auth import get_user_model
+from django.core.urlresolvers import reverse
+from rest_framework import status
+from rest_framework.test import APIClient
+
+from openslides.config.api import config
+from openslides.core.models import Tag
+from openslides.motions.models import Category, Motion
+from openslides.utils.test import TestCase
+
+
+class CreateMotion(TestCase):
+    """
+    Tests motion creation.
+    """
+    def setUp(self):
+        self.client.login(username='admin', password='admin')
+
+    def test_simple(self):
+        response = self.client.post(
+            reverse('motion-list'),
+            {'title': 'test_title_OoCoo3MeiT9li5Iengu9',
+             'text': 'test_text_thuoz0iecheiheereiCi'})
+        self.assertEqual(response.status_code, status.HTTP_201_CREATED)
+        motion = Motion.objects.get()
+        self.assertEqual(motion.title, 'test_title_OoCoo3MeiT9li5Iengu9')
+        self.assertEqual(motion.identifier, '1')
+        self.assertTrue(motion.submitters.exists())
+        self.assertEqual(motion.submitters.get().username, 'admin')
+
+    def test_with_reason(self):
+        response = self.client.post(
+            reverse('motion-list'),
+            {'title': 'test_title_saib4hiHaifo9ohp9yie',
+             'text': 'test_text_shahhie8Ej4mohvoorie',
+             'reason': 'test_reason_Ou8GivahYivoh3phoh9c'})
+        self.assertEqual(response.status_code, status.HTTP_201_CREATED)
+        self.assertEqual(Motion.objects.get().reason, 'test_reason_Ou8GivahYivoh3phoh9c')
+
+    def test_without_data(self):
+        response = self.client.post(
+            reverse('motion-list'),
+            {})
+        self.assertEqual(response.status_code, status.HTTP_400_BAD_REQUEST)
+        self.assertEqual(response.data, {'title': ['This field is required.'], 'text': ['This field is required.']})
+
+    def test_with_category(self):
+        category = Category.objects.create(
+            name='test_category_name_CiengahzooH4ohxietha',
+            prefix='TEST_PREFIX_la0eadaewuec3seoxeiN')
+        response = self.client.post(
+            reverse('motion-list'),
+            {'title': 'test_title_Air0bahchaiph1ietoo2',
+             'text': 'test_text_chaeF9wosh8OowazaiVu',
+             'category': category.pk})
+        self.assertEqual(response.status_code, status.HTTP_201_CREATED)
+        motion = Motion.objects.get()
+        self.assertEqual(motion.category, category)
+        self.assertEqual(motion.identifier, 'TEST_PREFIX_la0eadaewuec3seoxeiN 1')
+
+    def test_with_submitters(self):
+        submitter_1 = get_user_model().objects.create_user(
+            username='test_username_ooFe6aebei9ieQui2poo',
+            password='test_password_vie9saiQu5Aengoo9ku0')
+        submitter_2 = get_user_model().objects.create_user(
+            username='test_username_eeciengoc4aihie5eeSh',
+            password='test_password_peik2Eihu5oTh7siequi')
+        response = self.client.post(
+            reverse('motion-list'),
+            {'title': 'test_title_pha7moPh7quoth4paina',
+             'text': 'test_text_YooGhae6tiangung5Rie',
+             'submitters': [submitter_1.pk, submitter_2.pk]})
+        self.assertEqual(response.status_code, status.HTTP_201_CREATED)
+        motion = Motion.objects.get()
+        self.assertEqual(motion.submitters.count(), 2)
+
+    def test_with_one_supporter(self):
+        supporter = get_user_model().objects.create_user(
+            username='test_username_ahGhi4Quohyee7ohngie',
+            password='test_password_Nei6aeh8OhY8Aegh1ohX')
+        response = self.client.post(
+            reverse('motion-list'),
+            {'title': 'test_title_Oecee4Da2Mu9EY6Ui4mu',
+             'text': 'test_text_FbhgnTFgkbjdmvcjbffg',
+             'supporters': [supporter.pk]})
+        self.assertEqual(response.status_code, status.HTTP_201_CREATED)
+        motion = Motion.objects.get()
+        self.assertEqual(motion.supporters.get().username, 'test_username_ahGhi4Quohyee7ohngie')
+
+    def test_with_tag(self):
+        tag = Tag.objects.create(name='test_tag_iRee3kiecoos4rorohth')
+        response = self.client.post(
+            reverse('motion-list'),
+            {'title': 'test_title_Hahke4loos4eiduNiid9',
+             'text': 'test_text_johcho0Ucaibiehieghe',
+             'tags': [tag.pk]})
+        self.assertEqual(response.status_code, status.HTTP_201_CREATED)
+        motion = Motion.objects.get()
+        self.assertEqual(motion.tags.get().name, 'test_tag_iRee3kiecoos4rorohth')
+
+    def test_with_workflow(self):
+        self.assertEqual(config['motion_workflow'], '1')
+        response = self.client.post(
+            reverse('motion-list'),
+            {'title': 'test_title_eemuR5hoo4ru2ahgh5EJ',
+             'text': 'test_text_ohviePopahPhoili7yee',
+             'workflow': '2'})
+        self.assertEqual(response.status_code, status.HTTP_201_CREATED)
+        motion = Motion.objects.get()
+        self.assertEqual(motion.state.workflow.pk, 2)
+
+
+class UpdateMotion(TestCase):
+    """
+    Tests updating motions.
+    """
+    def setUp(self):
+        self.client = APIClient()
+        self.client.login(username='admin', password='admin')
+        self.motion = Motion(
+            title='test_title_aeng7ahChie3waiR8xoh',
+            text='test_text_xeigheeha7thopubeu4U')
+        self.motion.save()
+
+    def test_simple_patch(self):
+        response = self.client.patch(
+            reverse('motion-detail', args=[self.motion.pk]),
+            {'identifier': 'test_identifier_jieseghohj7OoSah1Ko9'})
+        self.assertEqual(response.status_code, status.HTTP_200_OK)
+        motion = Motion.objects.get()
+        self.assertEqual(motion.title, 'test_title_aeng7ahChie3waiR8xoh')
+        self.assertEqual(motion.identifier, 'test_identifier_jieseghohj7OoSah1Ko9')
+
+    def test_patch_workflow(self):
+        self.assertEqual(config['motion_workflow'], '1')
+        response = self.client.patch(
+            reverse('motion-detail', args=[self.motion.pk]),
+            {'workflow': '2'})
+        self.assertEqual(response.status_code, status.HTTP_200_OK)
+        motion = Motion.objects.get()
+        self.assertEqual(motion.title, 'test_title_aeng7ahChie3waiR8xoh')
+        self.assertEqual(motion.workflow, 2)
+
+    def test_patch_supporters(self):
+        supporter = get_user_model().objects.create_user(
+            username='test_username_ieB9eicah0uqu6Phoovo',
+            password='test_password_XaeTe3aesh8ohg6Cohwo')
+        response = self.client.patch(
+            reverse('motion-detail', args=[self.motion.pk]),
+            {'supporters': [supporter.pk]})
+        self.assertEqual(response.status_code, status.HTTP_200_OK)
+        motion = Motion.objects.get()
+        self.assertEqual(motion.title, 'test_title_aeng7ahChie3waiR8xoh')
+        self.assertEqual(motion.supporters.get().username, 'test_username_ieB9eicah0uqu6Phoovo')
+
+    def test_removal_of_supporters(self):
+        admin = get_user_model().objects.get(username='admin')
+        group_staff = admin.groups.get(name='Staff')
+        admin.groups.remove(group_staff)
+        self.motion.submitters.add(admin)
+        supporter = get_user_model().objects.create_user(
+            username='test_username_ahshi4oZin0OoSh9chee',
+            password='test_password_Sia8ahgeenixu5cei2Ib')
+        self.motion.supporters.add(supporter)
+        config['motion_remove_supporters'] = True
+        self.assertEqual(self.motion.supporters.count(), 1)
+
+        response = self.client.patch(
+            reverse('motion-detail', args=[self.motion.pk]),
+            {'title': 'new_title_ohph1aedie5Du8sai2ye'})
+
+        self.assertEqual(response.status_code, status.HTTP_200_OK)
+        motion = Motion.objects.get()
+        self.assertEqual(motion.title, 'new_title_ohph1aedie5Du8sai2ye')
+        self.assertEqual(motion.supporters.count(), 0)
+
+
+class ManageVersion(TestCase):
+    """
+    Tests permitting and deleting versions.
+    """
+    def setUp(self):
+        self.client = APIClient()
+        self.client.login(username='admin', password='admin')
+        self.motion = Motion(
+            title='test_title_InieJ5HieZieg1Meid7K',
+            text='test_text_daePhougho7EenguWe4g')
+        self.motion.save()
+        self.version_2 = self.motion.get_new_version(title='new_title_fee7tef0seechazeefiW')
+        self.motion.save(use_version=self.version_2)
+
+    def test_permit(self):
+        self.assertEqual(Motion.objects.get(pk=self.motion.pk).active_version.version_number, 2)
+        response = self.client.put(
+            reverse('motion-manage-version', args=[self.motion.pk]),
+            {'version_number': '1'})
+        self.assertEqual(response.status_code, status.HTTP_200_OK)
+        self.assertEqual(response.data, {'detail': 'Version 1 permitted successfully.'})
+        self.assertEqual(Motion.objects.get(pk=self.motion.pk).active_version.version_number, 1)
+
+    def test_permit_invalid_version(self):
+        response = self.client.put(
+            reverse('motion-manage-version', args=[self.motion.pk]),
+            {'version_number': '3'})
+        self.assertEqual(response.status_code, status.HTTP_404_NOT_FOUND)
+
+    def test_delete(self):
+        response = self.client.delete(
+            reverse('motion-manage-version', args=[self.motion.pk]),
+            {'version_number': '1'})
+        self.assertEqual(response.status_code, status.HTTP_200_OK)
+        self.assertEqual(response.data, {'detail': 'Version 1 deleted successfully.'})
+        self.assertEqual(Motion.objects.get(pk=self.motion.pk).versions.count(), 1)
+
+    def test_delete_active_version(self):
+        response = self.client.delete(
+            reverse('motion-manage-version', args=[self.motion.pk]),
+            {'version_number': '2'})
+        self.assertEqual(response.status_code, status.HTTP_400_BAD_REQUEST)
+        self.assertEqual(response.data, {'detail': 'You can not delete the active version of a motion.'})
+
+
+class SupportMotion(TestCase):
+    """
+    Tests supporting a motion.
+    """
+    def setUp(self):
+        self.admin = get_user_model().objects.get(username='admin')
+        self.admin.groups.add(3)
+        self.client.login(username='admin', password='admin')
+        self.motion = Motion(
+            title='test_title_chee7ahCha6bingaew4e',
+            text='test_text_birah1theL9ooseeFaip')
+        self.motion.save()
+
+    def test_support(self):
+        config['motion_min_supporters'] = 1
+        response = self.client.post(reverse('motion-support', args=[self.motion.pk]))
+        self.assertEqual(response.status_code, status.HTTP_200_OK)
+        self.assertEqual(response.data, {'detail': 'You have supported this motion successfully.'})
+
+    def test_unsupport(self):
+        config['motion_min_supporters'] = 1
+        self.motion.supporters.add(self.admin)
+        response = self.client.delete(reverse('motion-support', args=[self.motion.pk]))
+        self.assertEqual(response.status_code, status.HTTP_200_OK)
+        self.assertEqual(response.data, {'detail': 'You have unsupported this motion successfully.'})
+
+
+class SetState(TestCase):
+    """
+    Tests setting a state.
+    """
+    def setUp(self):
+        self.client = APIClient()
+        self.client.login(username='admin', password='admin')
+        self.motion = Motion(
+            title='test_title_iac4ohquie9Ku6othieC',
+            text='test_text_Xohphei6Oobee0Evooyu')
+        self.motion.save()
+        self.state_id_accepted = 2  # This should be the id of the state 'accepted'.
+
+    def test_set_state(self):
+        response = self.client.put(
+            reverse('motion-set-state', args=[self.motion.pk]),
+            {'state': self.state_id_accepted})
+
+        self.assertEqual(response.status_code, status.HTTP_200_OK)
+        self.assertEqual(response.data, {'detail': 'The state of the motion was set to accepted.'})
+        self.assertEqual(Motion.objects.get(pk=self.motion.pk).state.name, 'accepted')
+
+    def test_set_state_with_string(self):
+        # Using a string is not allowed even if it is the correct name of the state.
+        response = self.client.put(
+            reverse('motion-set-state', args=[self.motion.pk]),
+            {'state': 'accepted'})
+        self.assertEqual(response.status_code, status.HTTP_400_BAD_REQUEST)
+        self.assertEqual(response.data, {'detail': 'Invalid data. State must be an integer.'})
+
+    def test_set_unknown_state(self):
+        invalid_state_id = 0
+        response = self.client.put(
+            reverse('motion-set-state', args=[self.motion.pk]),
+            {'state': invalid_state_id})
+        self.assertEqual(response.status_code, status.HTTP_400_BAD_REQUEST)
+        self.assertEqual(response.data, {'detail': 'You can not set the state to %d.' % invalid_state_id})
+
+    def test_reset(self):
+        self.motion.set_state(self.state_id_accepted)
+        self.motion.save()
+        response = self.client.put(reverse('motion-set-state', args=[self.motion.pk]))
+        self.assertEqual(response.status_code, status.HTTP_200_OK)
+        self.assertEqual(response.data, {'detail': 'The state of the motion was set to submitted.'})
+        self.assertEqual(Motion.objects.get(pk=self.motion.pk).state.name, 'submitted')
diff --git a/tests/old/motions/test_csv_import.py b/tests/old/motions/test_csv_import.py
index 4f58e5be3..2fc0c58d9 100644
--- a/tests/old/motions/test_csv_import.py
+++ b/tests/old/motions/test_csv_import.py
@@ -49,8 +49,8 @@ class CSVImport(TestCase):
         self.assertEqual(motion1.title, u'Entlastung des Vorstandes')
         self.assertEqual(motion1.text, u'Die Versammlung möge beschließen, den Vorstand für seine letzte Legislaturperiode zu entlasten.')
         self.assertEqual(motion1.reason, u'Bericht erfolgt mündlich.')
-        self.assertEqual(len(motion1.submitter.all()), 1)
-        self.assertEqual(motion1.submitter.all()[0].person, self.normal_user)
+        self.assertEqual(len(motion1.submitters.all()), 1)
+        self.assertEqual(motion1.submitters.all()[0], self.normal_user)
         self.assertTrue(motion1.category is None)
         self.assertTrue('Submitter unknown.' in warning_message)
         self.assertTrue('Category unknown.' in warning_message)
@@ -61,8 +61,8 @@ class CSVImport(TestCase):
         self.assertHTMLEqual(motion2.text, u'''<p>Die Versammlung möge beschließen, die Satzung in § 2 Abs. 3 wie folgt zu ändern:</p>
                                                <p>Es wird vor dem Wort "Zweck" das Wort "gemeinnütziger" eingefügt.</p>''')
         self.assertEqual(motion2.reason, u'Die Änderung der Satzung ist aufgrund der letzten Erfahrungen eine sinnvolle Maßnahme, weil ...')
-        self.assertEqual(len(motion2.submitter.all()), 1)
-        self.assertEqual(motion2.submitter.all()[0].person, special_user)
+        self.assertEqual(len(motion2.submitters.all()), 1)
+        self.assertEqual(motion2.submitters.all()[0], special_user)
         self.assertEqual(motion2.category.name, u"Satzungsanträge")  # category is created automatically
 
         # check user 'John Doe'
diff --git a/tests/old/motions/test_models.py b/tests/old/motions/test_models.py
index 50bf3f177..85b5dcb3d 100644
--- a/tests/old/motions/test_models.py
+++ b/tests/old/motions/test_models.py
@@ -66,11 +66,10 @@ class ModelTest(TestCase):
 
     def test_supporter(self):
         self.assertFalse(self.motion.is_supporter(self.test_user))
-        self.motion.support(self.test_user)
+        self.motion.supporters.add(self.test_user)
         self.assertTrue(self.motion.is_supporter(self.test_user))
-        self.motion.unsupport(self.test_user)
+        self.motion.supporters.remove(self.test_user)
         self.assertFalse(self.motion.is_supporter(self.test_user))
-        self.motion.unsupport(self.test_user)
 
     def test_poll(self):
         self.motion.state = State.objects.get(pk=1)
@@ -89,10 +88,8 @@ class ModelTest(TestCase):
         self.motion.state = State.objects.get(pk=6)
         self.assertEqual(self.motion.state.name, 'permitted')
         self.assertEqual(self.motion.state.get_action_word(), 'Permit')
-        with self.assertRaises(WorkflowError):
-            self.motion.support(self.test_user)
-        with self.assertRaises(WorkflowError):
-            self.motion.unsupport(self.test_user)
+        self.assertFalse(self.motion.get_allowed_actions(self.test_user)['support'])
+        self.assertFalse(self.motion.get_allowed_actions(self.test_user)['unsupport'])
 
     def test_new_states_or_workflows(self):
         workflow_1 = Workflow.objects.create(name='W1')
diff --git a/tests/old/motions/test_views.py b/tests/old/motions/test_views.py
index d693d5f53..fc3d0cc02 100644
--- a/tests/old/motions/test_views.py
+++ b/tests/old/motions/test_views.py
@@ -135,7 +135,7 @@ class TestMotionDetailView(MotionViewTestCase):
     def test_get_without_required_permission_from_state_but_by_submitter(self):
         self.motion1.state.required_permission_to_see = 'motions.can_manage'
         self.motion1.state.save()
-        self.motion1.add_submitter(self.registered)
+        self.motion1.submitters.add(self.registered)
         self.check_url('/motions/1/', self.registered_client, 200)
 
 
@@ -360,7 +360,7 @@ class TestMotionUpdateView(MotionViewTestCase):
                                                         'reason': 'motion reason'})
         self.assertEqual(response.status_code, 403)
         motion = Motion.objects.get(pk=1)
-        motion.add_submitter(self.delegate)
+        motion.submitters.add(self.delegate)
         response = self.delegate_client.post(self.url, {'title': 'my title',
                                                         'text': 'motion text',
                                                         'reason': 'motion reason'})
@@ -468,7 +468,7 @@ class TestMotionUpdateView(MotionViewTestCase):
              'text': 'eequei1Tee1aegeNgee0',
              'submitter': self.delegate.id})
         self.assertEqual(response.status_code, 403)
-        motion.add_submitter(self.delegate)
+        motion.submitters.add(self.delegate)
 
         # Edit three times, without removal of supporters, with removal and in another state
         for i in range(3):
@@ -480,9 +480,9 @@ class TestMotionUpdateView(MotionViewTestCase):
                  'text': 'Lohjuu1aebewiu2or3oh'})
             self.assertRedirects(response, '/motions/%s/' % motion.id)
             if i == 0 or i == 2:
-                self.assertTrue(self.registered in Motion.objects.get(pk=motion.pk).supporters)
+                self.assertTrue(self.registered in Motion.objects.get(pk=motion.pk).supporters.all())
             else:
-                self.assertFalse(self.registered in Motion.objects.get(pk=motion.pk).supporters)
+                self.assertFalse(self.registered in Motion.objects.get(pk=motion.pk).supporters.all())
                 # Preparing the comming (third) run
                 motion = Motion.objects.get(pk=motion.pk)
                 motion.support(self.registered)
@@ -577,7 +577,7 @@ class TestMotionDeleteView(MotionViewTestCase):
     def test_delegate(self):
         response = self.delegate_client.post('/motions/2/del/', {'yes': 'yes'})
         self.assertEqual(response.status_code, 403)
-        Motion.objects.get(pk=2).add_submitter(self.delegate)
+        Motion.objects.get(pk=2).submitters.add(self.delegate)
         response = self.delegate_client.post('/motions/2/del/', {'yes': 'yes'})
         self.assertEqual(response.status_code, 403)
 
diff --git a/tests/unit/motions/__init__.py b/tests/unit/motions/__init__.py
new file mode 100644
index 000000000..e69de29bb
diff --git a/tests/unit/motions/test_views.py b/tests/unit/motions/test_views.py
new file mode 100644
index 000000000..f3cbe49be
--- /dev/null
+++ b/tests/unit/motions/test_views.py
@@ -0,0 +1,81 @@
+from unittest import TestCase
+from unittest.mock import MagicMock, patch
+
+from rest_framework.exceptions import PermissionDenied
+
+from openslides.motions.views import MotionViewSet
+
+
+class MotionViewSetCreate(TestCase):
+    """
+    Tests create view of MotionViewSet.
+    """
+    def setUp(self):
+        self.request = MagicMock()
+        self.view_instance = MotionViewSet()
+        self.view_instance.request = self.request
+        self.view_instance.format_kwarg = MagicMock()
+        self.view_instance.get_serializer = get_serializer_mock = MagicMock()
+        get_serializer_mock.return_value = self.mock_serializer = MagicMock()
+
+    @patch('openslides.motions.views.config')
+    def test_simple_create(self, mock_config):
+        self.request.user.has_perm.return_value = True
+        self.view_instance.create(self.request)
+        self.mock_serializer.save.assert_called_with(request_user=self.request.user)
+
+    @patch('openslides.motions.views.config')
+    def test_user_without_can_create_perm(self, mock_config):
+        self.request.user.has_perm.return_value = False
+        with self.assertRaises(PermissionDenied):
+            self.view_instance.create(self.request)
+
+
+class MotionViewSetUpdate(TestCase):
+    """
+    Tests update view of MotionViewSet.
+    """
+    def setUp(self):
+        self.request = MagicMock()
+        self.view_instance = MotionViewSet()
+        self.view_instance.request = self.request
+        self.view_instance.kwargs = MagicMock()
+        self.view_instance.get_object = MagicMock()
+        self.view_instance.get_serializer = get_serializer_mock = MagicMock()
+        get_serializer_mock.return_value = self.mock_serializer = MagicMock()
+
+    @patch('openslides.motions.views.config')
+    def test_simple_update(self, mock_config):
+        self.request.user.has_perm.return_value = True
+        self.view_instance.update(self.request)
+        self.mock_serializer.save.assert_called_with()
+
+    @patch('openslides.motions.views.config')
+    def test_user_without_perms(self, mock_config):
+        self.request.user.has_perm.return_value = False
+        with self.assertRaises(PermissionDenied):
+            self.view_instance.update(self.request)
+
+
+class MotionViewSetManageVersion(TestCase):
+    """
+    Tests views of MotionViewSet to manage versions.
+    """
+    def setUp(self):
+        self.request = MagicMock()
+        self.view_instance = MotionViewSet()
+        self.view_instance.request = self.request
+        self.view_instance.get_object = get_object_mock = MagicMock()
+        get_object_mock.return_value = self.mock_motion = MagicMock()
+
+    def test_activate_version(self):
+        self.request.method = 'PUT'
+        self.request.user.has_perm.return_value = True
+        self.view_instance.manage_version(self.request)
+        self.mock_motion.save.assert_called_with(update_fields=['active_version'])
+
+    def test_delete_version(self):
+        self.request.method = 'DELETE'
+        self.request.user.has_perm.return_value = True
+        self.view_instance.manage_version(self.request)
+        self.mock_motion.versions.get.return_value.delete.assert_called_with()