Hi,

Please refer to the below code if you want to change the word 'Invoice' to 'Note' on the invoice report .

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

    <xpath expr="//div[1]/h2/span[1]" position="replace">

        <span t-if="o.move_type == 'out_invoice' and o.state == 'posted'">Note</span>

    </xpath>

</template>

Hope it helps