I want to rename 'Product' Name to Part Number in Sale.order form Line ,But this Xpath is not working why ? need a help.
<record id="view_order_form_double_validation" model="ir.ui.view">
<field name="name">sale.order.form</field>
<field name="model">sale.order</field>
<field name="inherit_id" ref="sale.view_order_form"/>
<field name="priority">90</field>
<field name="arch" type="xml">
<xpath
expr="//field[@name='order_line']/tree/field[@name='product_id']" position="attributes">
<attribute name="string">PartNumber</attribute>
</xpath>
</field>
</record>