diff --git a/product/ERP5/Document/Resource.py b/product/ERP5/Document/Resource.py
index 2b10871717a8a5ac245f748dc462633c2c7e98e9..d85a904785d20087b1e3f3139e3b9ed52c873dc6 100755
--- a/product/ERP5/Document/Resource.py
+++ b/product/ERP5/Document/Resource.py
@@ -529,7 +529,7 @@ class Resource(XMLMatrix, CoreResource, Variated):
           priced_quantity = self.getPricedQuantity()
           unit_base_price = base_price / priced_quantity
       else:
-        priced_quantity = mapped_value.getPricedQuantity()
+        priced_quantity = self.getPricedQuantity()
         unit_base_price = base_price / priced_quantity
 
       return unit_base_price