partner-contact/base_location/partner_view.xml

<?xml version="1.0" encoding="UTF-8"?>
<openerp>
  <data>
    <record id="view_partner_form" model="ir.ui.view">
      <field name="name">res.partner.zip_id.2</field>
      <field name="model">res.partner</field>
      <field name="inherit_id" ref="base.view_partner_form"/>
      <field name="arch" type="xml">
        <field name="city" position="before">
          <field name="zip_id"
                 on_change="onchange_zip_id(zip_id)"
                 placeholder="City completion"/>
        </field>
      </field>
    </record>
  </data>
</openerp>