diff --git a/trytond/trytond/modules/party_relationship/party.py b/trytond/trytond/modules/party_relationship/party.py
index 5ab3464..e55208f 100644
--- a/trytond/trytond/modules/party_relationship/party.py
+++ b/trytond/trytond/modules/party_relationship/party.py
@@ -5,6 +5,7 @@ from sql import Union, As, Column, Null
 from trytond.pool import Pool, PoolMeta
 from trytond.model import ModelSQL, ModelView, fields
 from trytond.transaction import Transaction
+from trytond.pyson import Eval, If

 __all__ = ['RelationType', 'PartyRelation', 'PartyRelationAll', 'Party']

@@ -29,6 +30,17 @@ class PartyRelation(ModelSQL):
         ondelete='CASCADE')
     type = fields.Many2One('party.relation.type', 'Type', required=True,
         select=True)
+    start_date = fields.Date("Start Date", domain=[
+        If(Eval('start_date') & Eval('end_date'),
+                ('start_date', '<=', Eval('end_date', None)),
+            ()),
+        ], depends=['end_date'])
+    end_date = fields.Date("End Date", domain=[
+        If(Eval('start_date') & Eval('end_date'),
+                ('end_date', '>=', Eval('start_date', None)),
+            ()),
+        ], depends=['start_date'])
+

     @classmethod
     def search_rec_name(cls, name, clause):
diff --git a/trytond/trytond/modules/party_relationship/view/relation_form.xml b/trytond/trytond/modules/party_relationship/view/relation_form.xml
index 2c1cddd..572e45d 100644
--- a/trytond/trytond/modules/party_relationship/view/relation_form.xml
+++ b/trytond/trytond/modules/party_relationship/view/relation_form.xml
@@ -8,4 +8,9 @@ this repository contains the full copyright notices and license terms. -->
     <field name="type"/>
     <label name="to"/>
     <field name="to"/>
+    <newline/>
+    <label name="start_date"/>
+    <field name="start_date"/>
+    <label name="end_date"/>
+    <field name="end_date"/>
 </form>
diff --git a/trytond/trytond/modules/party_relationship/view/relation_tree.xml b/trytond/trytond/modules/party_relationship/view/relation_tree.xml
index 51fd69d..8fb8bb6 100644
--- a/trytond/trytond/modules/party_relationship/view/relation_tree.xml
+++ b/trytond/trytond/modules/party_relationship/view/relation_tree.xml
@@ -5,4 +5,6 @@ this repository contains the full copyright notices and license terms. -->
     <field name="from_" expand="2"/>
     <field name="type" expand="1"/>
     <field name="to" expand="2"/>
+    <field name="start_date"/>
+    <field name="end_date"/>
 </tree>