I am using Odoo 14, I would like to customize the header of 'report_invoice_document'. I tried to add this code:

<?xml version="1.0" encoding="utf-8"?>

  <odoo>

     <data>

       <template id="report_invoice_extend" inherit_id="account.report_invoice_document">

        <t t-call="my_module.external_layout_footer_inherit_cr">

        </t>

     </template>

    </data>

 </odoo>

<?xml version="1.0" encoding="utf-8"?>

<odoo>

<template id="external_layout_footer_inherit_cr"

            inherit_id="report.external_layout_footer">

            <xpath expr="//div[@class='footer']" position="replace">

                <div class="footer">

                    <span>Test</span>

                </div>

            </xpath>

        </template>

</odoo>

But I got this error :

raise ValueError(formatted_message).with_traceback(from_traceback) from from_exception odoo.exceptions.ValidationError: Error while validating view:

Element '<t t-call="my_module.external_layout_footer_inherit_cr">' cannot be located in parent view

What's wrong in my code? Any help please.