diff --git a/addons/purchase/purchase_view.xml b/addons/purchase/purchase_view.xml
index 8056da23e71..e1fce87dc8a 100644
--- a/addons/purchase/purchase_view.xml
+++ b/addons/purchase/purchase_view.xml
@@ -242,8 +242,8 @@
                                     <field name="date_planned"/>
                                     <field name="company_id" groups="base.group_multi_company" widget="selection"/>
                                     <field name="account_analytic_id" groups="purchase.group_analytic_accounting" domain="[('type','not in',('view','template'))]"/>
-                                    <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,parent.state,context)"/>
-                                    <field name="product_uom" groups="product.group_uom" on_change="onchange_product_uom(parent.pricelist_id,product_id,product_qty,product_uom,parent.partner_id, parent.date_order,parent.fiscal_position,date_planned,name,price_unit,parent.state,context)"/>
+                                    <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,False,parent.state,context)"/>
+                                    <field name="product_uom" groups="product.group_uom" on_change="onchange_product_uom(parent.pricelist_id,product_id,product_qty,product_uom,parent.partner_id, parent.date_order,parent.fiscal_position,date_planned,name,False,parent.state,context)"/>
                                     <field name="price_unit"/>
                                     <field name="taxes_id" widget="many2many_tags" domain="[('parent_id','=',False),('type_tax_use','!=','sale')]"/>
                                     <field name="price_subtotal"/>
@@ -422,8 +422,8 @@
                                 <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,False,'draft',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,'draft',context)" class="oe_inline"/>
-                                    <field name="product_uom" groups="product.group_uom" on_change="onchange_product_uom(parent.pricelist_id,product_id,product_qty,product_uom,parent.partner_id, parent.date_order,parent.fiscal_position,date_planned,name,price_unit,'draft',context)" class="oe_inline"/>
+                                    <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,False,'draft',context)" class="oe_inline"/>
+                                    <field name="product_uom" groups="product.group_uom" on_change="onchange_product_uom(parent.pricelist_id,product_id,product_qty,product_uom,parent.partner_id, parent.date_order,parent.fiscal_position,date_planned,name,False,'draft',context)" class="oe_inline"/>
                                 </div>
                                 <field name="price_unit"/>
                             </group>