flectra/addons/base_vat_autocomplete/views/res_partner_views.xml

<?xml version="1.0" encoding="utf-8"?>
<odoo>
    <record id="view_partner_form" model="ir.ui.view">
        <field name="name">res.partner.vat.inherit</field>
        <field name="model">res.partner</field>
        <field name="inherit_id" ref="base.view_partner_form"/>
        <field name="arch" type="xml">
            <xpath expr="//field[@name='vat']" position="replace">
            </xpath>
            <xpath expr="//label[@for='street']" position="before">
                <field name="vat" string="VAT" placeholder="e.g. BE0477472701"/>
            </xpath>
        </field>
    </record>

    <record id="view_partner_short_form" model="ir.ui.view">
        <field name="name">res.partner.short.vat.inherit</field>
        <field name="model">res.partner</field>
        <field name="inherit_id" ref="base.view_partner_short_form"/>
        <field name="arch" type="xml">
            <xpath expr="//field[@name='vat']" position="replace">
            </xpath>
            <xpath expr="//label[@for='street']" position="before">
                <field name="vat" string="VAT" placeholder="e.g. BE0477472701"/>
            </xpath>
        </field>
    </record>
</odoo>