diff --git a/openslides/agenda/models.py b/openslides/agenda/models.py
index 48e26a021..9bcc5d795 100644
--- a/openslides/agenda/models.py
+++ b/openslides/agenda/models.py
@@ -267,7 +267,7 @@ class Item(RESTModelMixin, models.Model):
         """
         Returns the number of this agenda item.
         """
-        if self.type == self.AGENDA_ITEM:
+        if not self.is_hidden():
             if self.parent is None:
                 sibling_no = self.sibling_no()
                 if config['agenda_numeral_system'] == 'arabic':
@@ -281,15 +281,16 @@ class Item(RESTModelMixin, models.Model):
 
     def sibling_no(self):
         """
-        Counts how many AGENDA_ITEMS with the same parent (siblings) have a
+        Counts how many agenda items with the same parent (siblings) have a
         smaller weight then this item.
 
-        Returns this number + 1 or 0 when self is not an AGENDA_ITEM.
+        Returns this number + 1.
         """
-        return Item.objects.filter(
-            parent=self.parent,
-            type=self.AGENDA_ITEM,
-            weight__lte=self.weight).count()
+        result = 0
+        for item in Item.objects.filter(parent=self.parent, weight__lte=self.weight):
+            if not item.is_hidden():
+                result += 1
+        return result
 
 
 class SpeakerManager(models.Manager):
diff --git a/openslides/agenda/views.py b/openslides/agenda/views.py
index 7b3b7c000..0d7555bf5 100644
--- a/openslides/agenda/views.py
+++ b/openslides/agenda/views.py
@@ -47,7 +47,7 @@ class ItemViewSet(ListModelMixin, RetrieveModelMixin, UpdateModelMixin, GenericV
             result = (self.request.user.has_perm('agenda.can_see') and
                       self.request.user.has_perm('agenda.can_see_hidden_items') and
                       self.request.user.has_perm('agenda.can_manage'))
-        elif self.action == 'speak':
+        elif self.action in ('speak', 'numbering'):
             result = (self.request.user.has_perm('agenda.can_see') and
                       self.request.user.has_perm('agenda.can_manage'))
         else:
@@ -219,6 +219,17 @@ class ItemViewSet(ListModelMixin, RetrieveModelMixin, UpdateModelMixin, GenericV
             response = Response(Item.objects.get_tree())
         return response
 
+    @list_route(methods=['post'])
+    def numbering(self, request):
+        """
+        Auto numbering of the agenda according to the config. Manually added
+        item numbers will be overwritten.
+        """
+        for item in Item.objects.all():
+            item.item_number = item.calc_item_no()
+            item.save()
+        return Response({'detail': _('The agenda has been numbered.')})
+
 
 # Views to generate PDFs
 
diff --git a/tests/integration/agenda/test_viewsets.py b/tests/integration/agenda/test_viewsets.py
index 9cfda9c83..c82bec1b1 100644
--- a/tests/integration/agenda/test_viewsets.py
+++ b/tests/integration/agenda/test_viewsets.py
@@ -2,7 +2,7 @@ from django.contrib.auth import get_user_model
 from django.core.urlresolvers import reverse
 from rest_framework.test import APIClient
 
-from openslides.agenda.models import Speaker
+from openslides.agenda.models import Item, Speaker
 from openslides.core.config import config
 from openslides.core.models import CustomSlide, Projector
 from openslides.utils.test import TestCase
@@ -233,3 +233,53 @@ class Speak(TestCase):
         else:
             success = False
         self.assertTrue(success)
+
+
+class Numbering(TestCase):
+    """
+    Tests view to number the agenda
+    """
+    def setUp(self):
+        self.client = APIClient()
+        self.client.login(username='admin', password='admin')
+        self.item_1 = CustomSlide.objects.create(title='test_title_thuha8eef7ohXar3eech').agenda_item
+        self.item_2 = CustomSlide.objects.create(title='test_title_eisah7thuxa1eingaeLo').agenda_item
+        self.item_2.weight = 2
+        self.item_2.save()
+        self.item_2_1 = CustomSlide.objects.create(title='test_title_Qui0audoaz5gie1phish').agenda_item
+        self.item_2_1.parent = self.item_2
+        self.item_2_1.save()
+        self.item_3 = CustomSlide.objects.create(title='test_title_ah7tphisheineisgaeLo').agenda_item
+        self.item_3.weight = 3
+        self.item_3.save()
+
+    def test_numbering(self):
+        response = self.client.post(reverse('item-numbering'))
+        self.assertEqual(response.status_code, 200)
+        self.assertEqual(Item.objects.get(pk=self.item_1.pk).item_number, '1')
+        self.assertEqual(Item.objects.get(pk=self.item_2.pk).item_number, '2')
+        self.assertEqual(Item.objects.get(pk=self.item_2_1.pk).item_number, '2.1')
+        self.assertEqual(Item.objects.get(pk=self.item_3.pk).item_number, '3')
+
+    def test_roman_numbering(self):
+        config['agenda_numeral_system'] = 'roman'
+
+        response = self.client.post(reverse('item-numbering'))
+
+        self.assertEqual(response.status_code, 200)
+        self.assertEqual(Item.objects.get(pk=self.item_1.pk).item_number, 'I')
+        self.assertEqual(Item.objects.get(pk=self.item_2.pk).item_number, 'II')
+        self.assertEqual(Item.objects.get(pk=self.item_2_1.pk).item_number, 'II.1')
+        self.assertEqual(Item.objects.get(pk=self.item_3.pk).item_number, 'III')
+
+    def test_with_hidden_item(self):
+        self.item_2.type = Item.HIDDEN_ITEM
+        self.item_2.save()
+
+        response = self.client.post(reverse('item-numbering'))
+
+        self.assertEqual(response.status_code, 200)
+        self.assertEqual(Item.objects.get(pk=self.item_1.pk).item_number, '1')
+        self.assertEqual(Item.objects.get(pk=self.item_2.pk).item_number, '')
+        self.assertEqual(Item.objects.get(pk=self.item_2_1.pk).item_number, '')
+        self.assertEqual(Item.objects.get(pk=self.item_3.pk).item_number, '2')