diff --git a/openslides/agenda/models.py b/openslides/agenda/models.py
index 8ce474efd..e7e5426ec 100644
--- a/openslides/agenda/models.py
+++ b/openslides/agenda/models.py
@@ -103,6 +103,17 @@ class Item(MPTTModel, SlideMixin):
         }
         return ItemOrderForm(initial=initial, prefix="i%d" % self.id)
 
+    def delete(self, with_children=False):
+        """
+        Delete the Item.
+        """
+        if not with_children:
+            for child in self.get_children():
+                child.move_to(self.parent)
+                child.save()
+        super(Item, self).delete()
+        Item.objects.rebuild()
+
     def get_absolute_url(self, link='view'):
         """
         Return the URL to this item. By default it is the Link to its
diff --git a/openslides/agenda/views.py b/openslides/agenda/views.py
index 387352cd6..57b933f16 100644
--- a/openslides/agenda/views.py
+++ b/openslides/agenda/views.py
@@ -143,13 +143,10 @@ class ItemDelete(DeleteView):
         self.object = self.get_object()
 
         if 'all' in request.POST:
-            self.object.delete()
+            self.object.delete(with_children=True)
             messages.success(request, _("Item <b>%s</b> and his children were successfully deleted.") % self.object)
         else:
-            for child in self.object.get_children():
-                child.parent = self.object.parent
-                child.save()
-            self.object.delete()
+            self.object.delete(with_children=False)
             messages.success(request, _("Item <b>%s</b> was successfully deleted.") % self.object)
 
     def gen_confirm_form(self, request, message, url, singleitem=False):
diff --git a/openslides/application/models.py b/openslides/application/models.py
index 2c0311a85..0e0247e01 100644
--- a/openslides/application/models.py
+++ b/openslides/application/models.py
@@ -26,6 +26,8 @@ from utils.utils import _propper_unicode
 from utils.translation_ext import ugettext as _
 from poll.models import BaseOption, BasePoll, CountVotesCast, CountInvalid, Vote
 
+from agenda.models import Item
+
 
 class Application(models.Model, SlideMixin):
     prefix = "application"
@@ -408,6 +410,10 @@ class Application(models.Model, SlideMixin):
         if self.number and not force:
             raise NameError('The application has already a number. ' \
                             'You can not delete it.')
+
+
+        for item in Item.objects.filter(releated_sid=self.sid):
+            item.delete()
         super(Application, self).delete()
 
     def writelog(self, text, user=None):
diff --git a/openslides/assignment/models.py b/openslides/assignment/models.py
index a754584eb..1475db47a 100644
--- a/openslides/assignment/models.py
+++ b/openslides/assignment/models.py
@@ -22,6 +22,8 @@ from projector.api import register_slidemodel
 from poll.models import BasePoll, CountInvalid, CountVotesCast, BaseOption, PublishPollMixin
 from utils.translation_ext import ugettext as _
 
+from agenda.models import Item
+
 
 class Assignment(models.Model, SlideMixin):
     prefix = 'assignment'
@@ -132,6 +134,11 @@ class Assignment(models.Model, SlideMixin):
     def get_agenda_title(self):
         return self.name
 
+    def delete(self):
+        for item in Item.objects.filter(releated_sid=self.sid):
+            item.delete()
+        super(Assignment, self).delete()
+
     def slide(self):
         """
         return the slide dict