diff --git a/product/ERP5/TargetSolver/CopyToTarget.py b/product/ERP5/TargetSolver/CopyToTarget.py
index 25fe3f6412ed076b7be4bf951e814c646a6fe36a..a591ba6ac49f20c0f7233df1c16eb77a9cb62fa3 100644
--- a/product/ERP5/TargetSolver/CopyToTarget.py
+++ b/product/ERP5/TargetSolver/CopyToTarget.py
@@ -142,7 +142,8 @@ class CopyToTarget(TargetSolver):
     if is_last_movement:
         delivery_quantity = \
             simulation_movement.getDeliveryValue().getQuantity()
-        simulation_movement.setDeliveryError(delivery_quantity -
+        delivery_ratio = simulation_movement.getDeliveryRatio()
+        simulation_movement.setDeliveryError(delivery_quantity * delivery_ratio -
             value_dict['quantity'])
     
     delivery = simulation_movement.getDeliveryValue()