partner-contact/partner_street_number/view/res_partner.xml

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

        <record id="view_partner_form" model="ir.ui.view">
            <field name="name">Add separate fields for street name and number</field>
            <field name="model">res.partner</field>
            <field name="inherit_id" ref="base.view_partner_form"/>
            <field name="arch" type="xml">
 
               <xpath expr="/form/sheet//div/field[@name='street']"
                       position="replace">
                    <div>
                        <field name="street_name" style="width: 80%%"
                               placeholder="Street..."
                               attrs="{'readonly': [('use_parent_address','=',True)]}"
                               />
                        <field name="street_number" style="width: 19%%"
                               placeholder="Number..."
                               attrs="{'readonly': [('use_parent_address','=',True)]}"
                               />
                    </div>
                </xpath>

                <xpath expr="//form[@string='Contact']/sheet/group/div/field[@name='street']"
                       position="replace">
                    <div>
                        <field name="street_name" style="width: 80%%"
                               placeholder="Street..."
                               attrs="{'readonly': [('use_parent_address','=',True)]}"
                               />
                        <field name="street_number" style="width: 19%%"
                               placeholder="Number..."
                               attrs="{'readonly': [('use_parent_address','=',True)]}"
                               />
                    </div>
                </xpath>

                <xpath expr="//field[@name='child_ids']" position="attributes">
                    <attribute name="context">{'default_parent_id': active_id, 'default_street_name': street_name, 'default_street_number': street_number, 'default_street2': street2, 'default_city': city, 'default_state_id': state_id, 'default_zip': zip, 'default_country_id': country_id, 'default_supplier': supplier, 'default_customer': customer}</attribute>
                </xpath>

            </field>
        </record>
    </data>
</openerp>