Use domain of payment_term field for the search of default in prevention of

futur inherit that will add domain

purchase.py

@@ -98,8 +98,8 @@ 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, [],
-                context=context)
+        payment_term_ids = payment_term_obj.search(cursor, user,
+                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]