could someone please explain what i've done wrong with this code as the field will not appear in odoo
<odoo>
<record id="view_res_partner_form_inherit" model="ir.ui.view">
<field name="name">DRS Company Custom Fields</field>
<field name="model">res.partner</field>
<field name="type">form</field>
<field name="inherit_id" ref="base.view_partner_form"/>
<field name="arch" type="xml">
<xpath expr="//field[@name='lang']" position="after">
<field name="k_code" string="Supplier"/>
</xpath>
</field>
</record>
</odoo>
Look odoo inheritance: https://goo.gl/4Zyc9d