Odoo-Build/snippets/sale.report_blanketorder_document.replace_title.xml

<?xml version="1.0"?>
<data inherit_id="sale.report_blanketorder_document" priority="50">
    <xpath expr="//h2" position="replace">
        <h2>
            <span>Blanket Order # </span>
            <span t-field="doc.name"/>
        </h2>
    </xpath>
</data>