partner_view.xml

<?xml version="1.0" encoding="utf-8"?>
<openerp>
    <data>
        <!-- Add the SIREN and RC -->
        <record model="ir.ui.view" id="view_partner_add">
            <field name="name">res.partner.form.siret</field>
            <field name="model">res.partner</field>
            <field name="inherit_id" ref="account.view_partner_property_form" />
            <field name="arch" type="xml">
                <page string="Accounting" position="inside">
                    <group name="l10n_fr_siret">
                        <group col="4" name="siret">
                            <!-- oe_read_only hides the field in read mode in v8+ -->
                            <field name="siret" colspan="4" class="oe_read_only" />
                            <field name="siren" class="oe_edit_only"
                                string="SIREN/NIC" colspan="3"/>
                            <field name="nic" class="oe_edit_only" nolabel="1"/>
                        </group>
                        <group name="rcs">
                            <field name="company_registry" />
                        </group>
                    </group>
                </page>
            </field>
        </record>
    </data>
</openerp>