diff --git a/modules/purchase_trade/fee.py b/modules/purchase_trade/fee.py
index 4d09e81..685993a 100755
--- a/modules/purchase_trade/fee.py
+++ b/modules/purchase_trade/fee.py
@@ -57,10 +57,19 @@ class Fee(ModelSQL,ModelView):
         ('perqt', 'Per qt'),
         ('pprice', '% price'),
         ('pcost', '% cost price'),
+        ('ppack', 'Per packing'),
     ], 'Mode', required=True)
+    
     inherit_qt = fields.Boolean("Inh Qt")
     quantity = fields.Function(fields.Numeric("Qt",digits='unit'),'get_quantity')
-    unit = fields.Function(fields.Many2One('product.uom',"Unit"),'get_unit')
+    unit = fields.Many2One('product.uom',"Unit",domain=[
+            If(Eval('mode') == 'ppack',
+                ('category', '=', 8),
+                ()),
+            ],
+        states={
+            'readonly': Eval('mode') != 'ppack',
+            })
     inherit_shipment = fields.Boolean("Inh Sh",states={
             'invisible': (Eval('shipment_in')),
             })
@@ -81,9 +90,16 @@ class Fee(ModelSQL,ModelView):
 
     weight_type = fields.Selection([
         ('net', 'Net'),
-        ('brut', 'Brut'),
+        ('brut', 'Gross'),
         ], string='W. type')
 
+    @fields.depends('mode')
+    def on_change_with_unit(self, name=None):
+        if self.mode != 'ppack':
+            return self.get_unit()
+        else:
+            return self.unit
+
     def get_lots(self, name):
         logger.info("GET_LOTS_LINE:%s",self.line)
         logger.info("GET_LOTS_SHIPMENT_IN:%s",self.shipment_in)
@@ -155,7 +171,7 @@ class Fee(ModelSQL,ModelView):
     def default_p_r(cls):
         return 'pay'
 
-    def get_unit(self, name):
+    def get_unit(self, name=None):
         Lot = Pool().get('lot.lot')
         if self.lots:
             if self.lots[0].line:
diff --git a/modules/purchase_trade/view/fee_tree_sequence.xml b/modules/purchase_trade/view/fee_tree_sequence.xml
index 21bf150..fd14898 100755
--- a/modules/purchase_trade/view/fee_tree_sequence.xml
+++ b/modules/purchase_trade/view/fee_tree_sequence.xml
@@ -5,11 +5,12 @@ this repository contains the full copyright notices and license terms. -->
     <field name="type"/>
     <field name="product"/>
     <field name="supplier"/>
-    <field name="currency"/>
-    <field name="p_r"/>
     <field name="mode"/>
+    <field name="unit"/>
     <field name="price"/>
+    <field name="currency"/>
     <field name="weight_type"/>
+    <field name="p_r"/>
     <field name="quantity" symbol="unit"/>
     <field name="amount"/>
     <field name="inherit_shipment"/>
diff --git a/modules/purchase_trade/view/fee_tree_sequence2.xml b/modules/purchase_trade/view/fee_tree_sequence2.xml
index e408451..37a6e86 100755
--- a/modules/purchase_trade/view/fee_tree_sequence2.xml
+++ b/modules/purchase_trade/view/fee_tree_sequence2.xml
@@ -5,11 +5,12 @@ this repository contains the full copyright notices and license terms. -->
     <field name="type"/>
     <field name="product"/>
     <field name="supplier"/>
-    <field name="currency"/>
-    <field name="p_r"/>
     <field name="mode"/>
+    <field name="unit"/>
     <field name="price"/>
+    <field name="currency"/>
     <field name="weight_type"/>
+    <field name="p_r"/>
     <field name="quantity" symbol="unit"/>
     <field name="amount"/>
     <!-- <field name="purchase"/> -->