I tried the xpath with customer block, but there is none, this is the original architecture:

<t t-call="web.external_layout">

        <t t-set="doc" t-value="doc.with_context(lang=doc.partner_id.lang)"/>

        <t t-set="forced_vat" t-value="doc.fiscal_position_id.foreign_vat"/> <!-- So that it appears in the footer of the report instead of the company VAT if it's set -->

        <t t-set="address">

            <div t-field="doc.partner_id" class="mb-0" t-options="{&quot;widget&quot;: &quot;contact&quot;, &quot;fields&quot;: [&quot;address&quot;, &quot;name&quot;], &quot;no_marker&quot;: True}"/>

            <p t-if="doc.partner_id.vat" class="mb-0">

                <t t-if="doc.company_id.account_fiscal_country_id.vat_label" t-out="doc.company_id.account_fiscal_country_id.vat_label"/>

                <t t-else="">Tax ID</t>: <span t-field="doc.partner_id.vat"/>

In what block should I insert?

Hi,

Your code is correct in logic, but the issue is that your XPath is probably not matching anything in the quotation template. In some Odoo versions, the VAT field isn’t displayed, so the expression doesn’t find a target. A better anchor is the customer block (//div[@name='customer']).

Also make sure your custom field x_partner_contact_id is a stored Many2one to res.partner, and that you’ve upgraded your module or cleared cached reports after editing. Updating your XPath to the customer block will allow the buyer contact details to show correctly on the PDF.

<template id="report_saleorder_buyer_contact" inherit_id="sale.report_saleorder_document">

    <xpath expr="//div[@name='customer']" position="inside">

        <t t-if="doc.x_partner_contact_id">

            <p class="mb-0">

                <strong>Contactpersoon:</strong>

                <span t-field="doc.x_partner_contact_id.name"/>

                <t t-if="doc.x_partner_contact_id.email"> – <span t-field="doc.x_partner_contact_id.email"/></t>

                <t t-if="doc.x_partner_contact_id.phone"> – <span t-field="doc.x_partner_contact_id.phone"/></t>

            </p>

        </t>

    </xpath>

</template>

Hope it helps

The Quotation PDF already shows the Salesperson selected:

Form View:

PDF: