diff --git a/modules/purchase_trade/fee.py b/modules/purchase_trade/fee.py
index ebceaa1..3115aa7 100755
--- a/modules/purchase_trade/fee.py
+++ b/modules/purchase_trade/fee.py
@@ -324,7 +324,7 @@ class Fee(ModelSQL,ModelView):
                     fl.sale_line = l.sale_line.id
                     FeeLots.save([fl])
                     qt_line += l.get_current_quantity_converted()
-                    unit = l.line.unit
+                    unit = l.sale_line.unit
             if fee.shipment_in:
                 if fee.shipment_in.state == 'draft'or fee.shipment_in.state == 'started': 
                     lots = Lots.search(['lot_shipment_in','=',fee.shipment_in.id])