Support Cancellation Amount in Budget Cell

product/ERP5/Document/BudgetCell.py

@@ -143,23 +143,23 @@ class BudgetCell(Predicate, MetaNode, Movement):
                               'setSourceCredit')
     def setSourceCredit(self, source_credit):
       """Set the quantity.
-      Overloaded from movement, we always set the quantity, if not passed
+      Overloaded from movement, we always set the quantity, even if not passed
       """
       try:
         source_credit = float(source_credit)
       except TypeError:
         source_credit = 0.0
-      self.setQuantity(source_credit)
+      Movement.setSourceCredit(self, source_credit)
 
     def setSourceDebit(self, source_debit):
       """Set the quantity.
-      Overloaded from movement, we always set the quantity, if not passed
+      Overloaded from movement, we always set the quantity, even if not passed
       """
       try:
         source_debit = float(source_debit)
       except TypeError:
         source_debit = 0.0
-      self.setQuantity(-source_debit)
+      Movement.setSourceDebit(self, source_debit)
 
     security.declareProtected( Permissions.ModifyPortalContent,
                                'setDestinationDebit', 'setDestinationCredit' )