diff --git a/themis/datatypes/deputy.py b/themis/datatypes/deputy.py
index 91e4b12..ca32f15 100644
--- a/themis/datatypes/deputy.py
+++ b/themis/datatypes/deputy.py
@@ -2,6 +2,7 @@ from five import grok
 from zope import schema
 from zope.interface import implements
 from zope.component import adapts, provideAdapter
+from z3c.relationfield.interfaces import IHasRelations
 
 from z3c.relationfield.schema import RelationChoice
 from plone.formwidget.contenttree import ObjPathSourceBinder
@@ -51,7 +52,7 @@ class NameFromPersonNames(object):
         return self.context.firstname + ' ' + self.context.lastname
 
 class Deputy(Item):
-    implements(IDeputy)
+    implements(IDeputy, IHasRelations)
 
     @property
     def title(self):
diff --git a/themis/datatypes/ministry.py b/themis/datatypes/ministry.py
index 49cee1b..ec8f0c9 100644
--- a/themis/datatypes/ministry.py
+++ b/themis/datatypes/ministry.py
@@ -1,6 +1,7 @@
 from five import grok
 from zope import schema
 from zope.interface import implements
+from z3c.relationfield.interfaces import IHasRelations
 
 from plone.directives import form, dexterity
 from plone.dexterity.content import Item
@@ -14,7 +15,7 @@ class IMinistry(form.Schema):
     active = schema.Bool(title=_(u'Active'), default=True)
 
 class Ministry(Item):
-    implements(IMinistry)
+    implements(IMinistry, IHasRelations)
 
     @property
     def title(self):