diff --git a/addons/purchase/purchase.py b/addons/purchase/purchase.py
index 49489db36f8..27abd1d611a 100644
--- a/addons/purchase/purchase.py
+++ b/addons/purchase/purchase.py
@@ -667,7 +667,7 @@ class purchase_order_line(osv.osv):
 
     def product_id_change(self, cr, uid, ids, pricelist, product, qty, uom,
             partner_id, date_order=False, fiscal_position=False, date_planned=False,
-            name=False, price_unit=False, notes=False):
+            name=False, price_unit=False, notes=False, context={}):
         if not pricelist:
             raise osv.except_osv(_('No Pricelist !'), _('You have to select a pricelist or a supplier in the purchase form !\nPlease set one before choosing a product.'))
         if not  partner_id:
@@ -740,10 +740,10 @@ class purchase_order_line(osv.osv):
 
     def product_uom_change(self, cr, uid, ids, pricelist, product, qty, uom,
             partner_id, date_order=False, fiscal_position=False, date_planned=False,
-            name=False, price_unit=False, notes=False):
+            name=False, price_unit=False, notes=False, context={}):
         res = self.product_id_change(cr, uid, ids, pricelist, product, qty, uom,
                 partner_id, date_order=date_order, fiscal_position=fiscal_position, date_planned=date_planned,
-            name=name, price_unit=price_unit, notes=notes)
+            name=name, price_unit=price_unit, notes=notes, context=context)
         if 'product_uom' in res['value']:
             if uom and (uom != res['value']['product_uom']) and res['value']['product_uom']:
                 seller_uom_name = self.pool.get('product.uom').read(cr, uid, [res['value']['product_uom']], ['name'])[0]['name']
diff --git a/addons/purchase/purchase_view.xml b/addons/purchase/purchase_view.xml
index 557dcf354df..cb7224faaf0 100644
--- a/addons/purchase/purchase_view.xml
+++ b/addons/purchase/purchase_view.xml
@@ -358,8 +358,8 @@
                 <form string="Purchase Order Line">
                     <notebook colspan="4">
                         <page string="Order Line">
-                            <field name="product_id" colspan="4" context="{'partner_id':parent.partner_id, 'quantity':product_qty, 'pricelist':parent.pricelist_id, 'uom':product_uom, 'warehouse':parent.warehouse_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 name="product_qty" context="{'partner_id':parent.partner_id, 'quantity':product_qty, 'pricelist':parent.pricelist_id, 'uom':product_uom, 'warehouse':parent.warehouse_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 name="product_id" colspan="4" context="{'partner_id':parent.partner_id, 'quantity':product_qty, 'pricelist':parent.pricelist_id, 'uom':product_uom, 'warehouse':parent.warehouse_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,context)"/>
+                            <field name="product_qty" context="{'partner_id':parent.partner_id, 'quantity':product_qty, 'pricelist':parent.pricelist_id, 'uom':product_uom, 'warehouse':parent.warehouse_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,context)"/>
                             <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,date_planned,name,price_unit,notes)"/>
                             <field colspan="4" name="name"/>
                             <field name="date_planned" widget="date"/>