res_partner_demo.xml

<?xml version="1.0" encoding="UTF-8"?>
<openerp>
    <data>
        <record id="res_partner_grade_first" model="res.partner.grade">
            <field name="name">First</field>
            <field name="sequence">1</field>
        </record>
        <record id="base.res_partner_15" model="res.partner">
            <field name="grade_id" ref="res_partner_grade_first"/>
            <field name="partner_weight">10</field>
        </record>
    </data>
</openerp>