diff --git a/addons/purchase/purchase.py b/addons/purchase/purchase.py
index 97b4e37829a..2bcc62c06ac 100644
--- a/addons/purchase/purchase.py
+++ b/addons/purchase/purchase.py
@@ -246,6 +246,7 @@ class purchase_order(osv.osv):
         return {'value':{'location_id': res, 'dest_address_id': False}}
 
     def onchange_partner_id(self, cr, uid, ids, part):
+        
         if not part:
             return {'value':{'partner_address_id': False, 'fiscal_position': False}}
         addr = self.pool.get('res.partner').address_get(cr, uid, [part], ['default'])
@@ -678,9 +679,9 @@ class purchase_order_line(osv.osv):
         return res
 
     def product_uom_change(self, cr, uid, ids, pricelist, product, qty, uom,
-            partner_id, date_order=False):
+            partner_id, date_order=False,fiscal_position=False):
         res = self.product_id_change(cr, uid, ids, pricelist, product, qty, uom,
-                partner_id, date_order=date_order)
+                partner_id, date_order=date_order,fiscal_position=fiscal_position)
         if 'product_uom' in res['value']:
             del res['value']['product_uom']
         if not uom:
diff --git a/addons/purchase/purchase_view.xml b/addons/purchase/purchase_view.xml
index d86b6b5a710..58e46f10640 100644
--- a/addons/purchase/purchase_view.xml
+++ b/addons/purchase/purchase_view.xml
@@ -235,7 +235,7 @@
                         <page string="Order Line">
                             <field colspan="4" context="partner_id=parent.partner_id,quantity=product_qty,pricelist=parent.pricelist_id,uom=product_uom,warehouse=parent.warehouse_id" name="product_id" on_change="product_id_change(parent.pricelist_id,product_id,product_qty,product_uom,parent.partner_id, parent.date_order,parent.fiscal_position,date_planned,name,price_unit,notes)"/>
                             <field context="partner_id=parent.partner_id,quantity=product_qty,pricelist=parent.pricelist_id,uom=product_uom,warehouse=parent.warehouse_id" name="product_qty" on_change="product_id_change(parent.pricelist_id,product_id,product_qty,product_uom,parent.partner_id,parent.date_order,parent.fiscal_position,date_planned,name,price_unit,notes)"/>
-                            <field name="product_uom" on_change="product_uom_change(parent.pricelist_id,product_id,product_qty,product_uom,parent.partner_id, parent.date_order)"/>
+                            <field name="product_uom" on_change="product_uom_change(parent.pricelist_id,product_id,product_qty,product_uom,parent.partner_id, parent.date_order,parent.fiscal_position)"/>
                             <field colspan="4" name="name"/>
                             <field name="date_planned" widget="date"/>
                             <field name="price_unit"/>