diff --git a/modules/purchase_trade/fee.py b/modules/purchase_trade/fee.py
index 80583b6..1bf136f 100755
--- a/modules/purchase_trade/fee.py
+++ b/modules/purchase_trade/fee.py
@@ -70,7 +70,7 @@ class Fee(ModelSQL,ModelView):
                 ()),
             ],
         states={
-            'readonly': (Eval('mode') != 'ppack' | Eval('mode') != 'perqt'),
+            'readonly': (Eval('mode') != 'ppack' & Eval('mode') != 'perqt'),
             })
     packing_category = fields.Function(fields.Integer("Packing Category"),'get_packing_category')
     inherit_shipment = fields.Boolean("Inh Sh",states={