<data priority="50">
    <xpath expr="//table[@name='invoice_line_table']//td[@name='account_invoice_line_name']/span[1]" position="after">
        <t t-set="license_ids" t-value="line.sale_line_ids.mapped('license_ids')"/>
        <t t-if="license_ids">
            <br />
            <span>Licenses: <t t-esc="', '.join(license_ids.mapped('name'))"/></span>
        </t>
    </xpath>
</data>
