diff --git a/modules/purchase_trade/fee.py b/modules/purchase_trade/fee.py
index 216b48f..4b13c7c 100755
--- a/modules/purchase_trade/fee.py
+++ b/modules/purchase_trade/fee.py
@@ -72,7 +72,7 @@ class Fee(ModelSQL,ModelView):
         states={
             'readonly': (Bool(Eval('mode') != 'ppack') & Bool(Eval('mode') != 'perqt')),
             })
-    packing_category = fields.Function(fields.Integer("Packing Category"),'get_packing_category')
+    packing_category = fields.Function(fields.Many2One('product.uom.category',"Packing Category"),'get_packing_category')
     inherit_shipment = fields.Boolean("Inh Sh",states={
             'invisible': (Eval('shipment_in')),
             })