diff --git a/purchase.py b/purchase.py
index 52a71c2480..7d9a54ad1b 100644
--- a/purchase.py
+++ b/purchase.py
@@ -116,7 +116,10 @@ class Purchase(
             'readonly': ((Eval('state') != 'draft')
                 | Eval('lines', [0])),
             },
-        depends=['state'])
+        search_context={
+            'related_party': Eval('party'),
+            },
+        depends=['state', 'party'])
     invoice_address = fields.Many2One('party.address', 'Invoice Address',
         domain=[
             ('party', '=', If(Bool(Eval('invoice_party')),