diff --git a/product/ERP5/Document/OrderBuilder.py b/product/ERP5/Document/OrderBuilder.py
index ac07afb6b904f9e5c33ed479069fdfc59e6819f0..7b17b457838c891c9796683c8a849ed7763b2c26 100644
--- a/product/ERP5/Document/OrderBuilder.py
+++ b/product/ERP5/Document/OrderBuilder.py
@@ -243,7 +243,7 @@ class OrderBuilder(XMLObject, Amount, Predicate):
     for movement_group in movement_group_list:
       tmp_result, tmp_property_dict = movement_group.test(
         instance, divergence_list)
-      if tmp_result == False:
+      if not tmp_result:
         result = tmp_result
       new_property_dict.update(tmp_property_dict)
     return result, new_property_dict