diff --git a/purchase.py b/purchase.py
index 8f38ebe155..178128afac 100644
--- a/purchase.py
+++ b/purchase.py
@@ -108,7 +108,7 @@ class Purchase(OSV):
     def default_payment_term(self, cursor, user, context=None):
         payment_term_obj = self.pool.get('account.invoice.payment_term')
         payment_term_ids = payment_term_obj.search(cursor, user,
-                self.payment_term._domain, context=context)
+                self.payment_term.domain, context=context)
         if len(payment_term_ids) == 1:
             return payment_term_obj.name_get(cursor, user, payment_term_ids,
                     context=context)[0]
@@ -117,7 +117,7 @@ class Purchase(OSV):
     def default_warehouse(self, cursor, user, context=None):
         location_obj = self.pool.get('stock.location')
         location_ids = location_obj.search(cursor, user,
-                self.warehouse._domain, context=context)
+                self.warehouse.domain, context=context)
         if len(location_ids) == 1:
             return location_obj.name_get(cursor, user, location_ids,
                     context=context)[0]