added cancellation amount property and use it for getSource/Destination Credit/Debit

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@15861 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5/Document/Movement.py

@@ -734,7 +734,9 @@ class Movement(XMLObject, Amount):
       quantity = float(quantity)
     except TypeError:
       quantity = 0.0
-    if quantity < 0:
+    if (quantity < 0 and not self.isCancellationAmount()):
+      return - quantity
+    elif quantity > 0 and self.isCancellationAmount():
       return - quantity
     else:
       return 0.0
@@ -750,7 +752,8 @@ class Movement(XMLObject, Amount):
       quantity = float(quantity)
     except TypeError:
       quantity = 0.0
-    if quantity < 0:
+    if quantity < 0 and not self.isCancellationAmount() \
+      or quantity > 0 and self.isCancellationAmount():
       return 0.0
     else:
       return quantity

product/ERP5/PropertySheet/Amount.py

@@ -91,6 +91,10 @@ class Amount:
       'acquisition_accessor_id'       : 'getQuantity',
       'acquisition_depends'           : None,
       'mode'        : 'w' },
+    { 'id'          : 'cancellation_amount',
+      'description' : 'defines if this quantity is used in order to cancel another one',
+      'type'        : 'boolean',
+      'mode'        : 'w' },
     # quantity_sign is used by QuantitySignMovementGroup
     # When comparing a delivery to a property_dict coming from a MovementGroup,
     # the DeliveryBuilder needs to have at least a specific property for each MovementGroup