Hey i am trying to extend the view which is already inherited
here is my product_form.py in party module
<?xml version="1.0"?>
<!-- This file is part of Tryton. The COPYRIGHT file at the top level of
this repository contains the full copyright notices and license terms. -->
<data>
<xpath expr="/form/field[@name='code']" position="replace">
<group col="-1" name="code" string="">
<field name="prefix_code"/>
<field name="suffix_code"/>
</group>
</xpath>
<xpath expr="/form/notebook/page[@id='general']/label[@name='type']"
position="before">
<label name="template"/>
<field name="template" colspan="3"/>
</xpath>
<xpath expr="/form/notebook/page/field[@name='products']" position="replace">
<group id="description" colspan="2" col="1" yexpand="1" yfill="1">
<separator name="description"/>
<field name="description"/>
</group>
</xpath>
<xpath expr="/form/notebook/page[@id='general']" position="after">
<page name="identifiers" col="1">
<field name="identifiers" pre_validate="1"
view_ids="product.identifier_view_list_sequence"/>
</page>
</xpath>
</data>
record xml of my custom module
<record model="ir.ui.view" id="product_view_form">
<field name="model">product.product</field>
<field name="inherit" ref="product.product_view_form"/>
<field name="name">product_form</field>
</record>
product_form.xml in my custom module/view
<?xml version="1.0"?>
<!-- This file is part of Tryton. The COPYRIGHT file at the top level of
this repository contains the full copyright notices and license terms. -->
<data>
<xpath expr="/xpath/page[@name='identifiers']" position="after">
<field name="add_hsn"/>
</xpath>
</data>
but i am getting the following error
AttributeError: Couldn't find tag (xpath: /xpath/page[@name='identifiers']) in parent view!