diff --git a/addons/purchase/purchase_view.xml b/addons/purchase/purchase_view.xml
index 41088f998a9..40f7ca11f97 100644
--- a/addons/purchase/purchase_view.xml
+++ b/addons/purchase/purchase_view.xml
@@ -384,7 +384,7 @@
                     <sheet>
                         <group>
                             <group>
-                                <field name="product_id" on_change="onchange_product_id(parent.pricelist_id,product_id,0,False,parent.partner_id, parent.date_order,parent.fiscal_position,date_planned,name,price_unit,context)"/>
+                                <field name="product_id" on_change="onchange_product_id(parent.pricelist_id,product_id,0,False,parent.partner_id, parent.date_order,parent.fiscal_position,date_planned,False,price_unit,context)"/>
                                 <label for="product_qty"/>
                                 <div>
                                     <field name="product_qty" on_change="onchange_product_id(parent.pricelist_id,product_id,product_qty,product_uom,parent.partner_id,parent.date_order,parent.fiscal_position,date_planned,name,price_unit,context)" class="oe_inline"/>