<tree editable="1">
   <field name="fee_type"/>
   <field name="fee_quantity" width="80"/>
   <field name="fee_unit" width="40"/>
   <field name="fee_price" width="80"/>
   <field name="fee_amount" width="100"/>
   <field name="fee_landed_cost" width="80"/>
   <field name="to_invoice" width="60"/>
</tree>
