do nothing if the new quantity is more than current quantity.

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@31459 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5/DeliverySolver/FIFO.py

@@ -62,8 +62,10 @@ class FIFO(DeliverySolver):
     """
     """
     result = []
-    simulation_movement_list = self._getSimulationMovementList()
     remaining_quantity = self.getTotalQuantity() - new_quantity
+    if remaining_quantity < 0:
+      return result
+    simulation_movement_list = self._getSimulationMovementList()
     for movement in simulation_movement_list:
       if remaining_quantity:
         quantity = movement.getQuantity()