- simplify and document decisions for applying and checking if something new was created

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@27607 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5/Document/TradeModelLine.py

@@ -192,10 +192,11 @@ class TradeModelLine(Predicate, XMLMatrix, Amount):
           # have to look on cells, if we don't, look on self)
           for movement in movement_list:
             if set(base_application_list)\
-                .intersection(set(movement.getBaseContributionList())):
-              if len(movement.getVariationCategoryList()) == 0 or \
-                  set(movement.getVariationCategoryList()).intersection(\
+                .intersection(set(movement.getBaseContributionList())) and \
+                len(movement.getVariationCategoryList()) == 0 or \
+                set(movement.getVariationCategoryList()).intersection( \
                 set(tmp_movement.getVariationCategoryList())):
+              # at least one base application is in base contributions and
               # if the movement have no variation category, it's the same as
               # if he have all variation categories
               quantity = tmp_movement.getQuantity(0.0)
@@ -228,8 +229,8 @@ class TradeModelLine(Predicate, XMLMatrix, Amount):
             elif model_slice_max:
               tmp_movement.setQuantity(model_slice_max-model_slice_min)
 
-        if not update:
-          if modified:
+        if not update and modified:
+          # no movements were updated, but something was modified, so new movement appeared
           aggregated_amount_list.append(tmp_movement)
 
       return aggregated_amount_list