partner-contact/partner_create_by_vat/views/res_partner_view.xml

<?xml version="1.0" encoding="utf-8"?>
<openerp>
    <data>

        <record id="view_partner_create_by_vat" model="ir.ui.view">
            <field name="name">res.partner.create.by.vat</field>
            <field name="model">res.partner</field>
            <field name="inherit_id" ref="base_vat.view_partner_form"/>
            <field name="arch" type="xml">
                <field name="vat" position="after">
           		    <button name="get_vies_data_from_vat"
 				            attrs="{'invisible': [
 				                ('vat', '=', False),
 				                ('is_company', '=', False )]}"
 				            colspan="2" string="Get Vies Data"
 				            type="object" icon="gtk-execute"/>
           	    </field>
            </field>
        </record>

    </data>
</openerp>