partner-contact/res_partner_fiscal_document/res_partner_view.xml

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

    <record model="ir.ui.view" id="view_partner_form_inherit_fiscal_authetication">
        <field name="name">partner.form.authentication</field>
        <field name="model">res.partner</field>
        <field name="inherit_id" ref="base.view_partner_form"/>
        <field name="type">form</field>
        <field name="arch" type="xml">
            <field name="category_id" position="after">
                <field name="fiscal_id_type" placeholder="ID Document Type"></field>
                <field name="fiscal_id" placeholder="ID Number"></field>
                <field name="fiscal_id_doc"></field>
            </field>
        </field>
    </record>

    </data>
</openerp>