contract/contract_invoice_merge_by_partner/views/res_partner_view.xml

<?xml version="1.0" encoding="utf-8"?>
<!-- Copyright 2016 Carlos Dauden <carlos.dauden@tecnativa.com>
     Copyright 2017 Vicent Cubells <vicent.cubells@tecnativa.com>
     License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl). -->
<odoo>

    <record id="view_partner_form" model="ir.ui.view">
        <field name="name">Partner Form Contract Invoice Merge</field>
        <field name="model">res.partner</field>
        <field name="inherit_id" ref="base.view_partner_form"/>
        <field name="arch" type="xml">
            <field name="user_id" position="after">
                <field name="contract_invoice_merge"/>
            </field>
        </field>
</record>

</odoo>