Odoo-Build/snippets/account.report_invoice_document.show_order_id.xml

<data inherit_id="account.report_invoice_document" priority="60">
    <xpath expr="//td[@name='account_invoice_line_name']" position="replace">
        <td name="account_invoice_line_name">
            <t t-if="not line.sale_line_ids.task_id.sale_line_id.order_id">
                <span class="o_bold" t-field="line.product_id.name"/>
                <br/>
                <span t-field="line.name"/>
            </t>
            <t t-if="line.sale_line_ids.task_id.sale_line_id.order_id">
        Dienstleistung gem&#xE4;ss Rapport # <span t-field="line.sale_line_ids.task_id.sale_line_id.order_id"/>
      </t>
        </td>
    </xpath>
</data>