~unifield-team/unifield-wm/us-826

        <record id="purchase_order_line_form_transport_inherit" model="ir.ui.view">

            <field name="name">purchase.order.line.form.transport.inherit</field>

            <field name="model">purchase.order.line</field>

            <field name="type">form</field>

            <field name="inherit_id" ref="purchase.purchase_order_line_form" />

            <field name="arch" type="xml">

                <data>

                    <!-- The field product_domain is True or False, so the result of the domain is [True, True] (only transport

                            products) or [True, False] (all products) -->

                    <xpath expr="/form/notebook//field[@name='product_id']" position="attributes">

                        <attribute name="domain">[parent.categ in ('transport', 'service') and ('type', '=', 'service_recep') or ('type', '!=', False), ('transport_ok', 'in', [True, parent.categ=='transport' and 't' or 'f'])]</attribute>

                    </xpath>

                </data>

            </field>

        </record>