giscedata_facturacio_view.xml

<?xml version="1.0"?>
<openerp>
    <data>
        <!-- Afegim l'apart d'enviament de factures per E-mail -->
        <record model="ir.ui.view" id="view_factura_ov_check_visible_form">
            <field name="name">view.factura.ov.check.visible.form</field>
            <field name="model">giscedata.facturacio.factura</field>
            <field name="inherit_id" ref="giscedata_facturacio.view_factura_form"/>
            <field name="type">form</field>
            <field name="arch" type="xml">
                <xpath expr="//label[@string='(keep empty to use the current period)']" position="after">
                    <group col="2" colspan="4">
                        <field name="visible_ov" readonly="1" select="2"/>
                    </group>
                </xpath>
            </field>
        </record>

        <record model="ir.ui.view" id="view_factura_ov_check_visible_tree_ov">
            <field name="name">view.factura.ov.check.visible.tree</field>
            <field name="model">giscedata.facturacio.factura</field>
            <field name="inherit_id" ref="giscedata_facturacio.view_factura_tree"/>
            <field name="arch" type="xml">
                <field name="state" position="after">
                    <field name="visible_ov" select="2"/>
                </field>
            </field>
        </record>
    </data>
</openerp>