diff --git a/product/ERP5/Document/Inventory.py b/product/ERP5/Document/Inventory.py
index b2fcc58f070f9e785085b6316022fa220de16e57..b57de32ef46c2cdec5f8c4d9e7d5c6d3eab04c39 100644
--- a/product/ERP5/Document/Inventory.py
+++ b/product/ERP5/Document/Inventory.py
@@ -195,9 +195,9 @@ class Inventory(Delivery):
       method = getattr(self, list_method)      
       for movement in method():
         if movement.getResourceValue() is not None and \
-            movement.getQuantity() not in (None, ''):
+            movement.getInventoriatedQuantity() not in (None, ''):
 
-          movement_quantity = movement.getQuantity()
+          movement_quantity = movement.getInventoriatedQuantity()
           # construct key to retrieve inventory into dict
           getter_list = [x['getter'] for x in inventory_calculation_dict['first_level']]
           key_list = []