orden_pago/orden_pago_sequence.xml

<openerp>
    <data noupdate="1">

        <!-- Sequences for repair.workorder -->
        <record id="seq_type_ordenpago" model="ir.sequence.type">
            <field name="name">Orden de Pago</field>
            <field name="code">orden.pago</field>
        </record>

        <record id="seq_orden_pago" model="ir.sequence">
            <field name="name">Orden de Pago</field>
            <field name="code">orden.pago</field>
            <field name="prefix">0</field>
            <field name="padding">7</field>
            <field name="company_id" eval="False"/>
        </record>

    </data>
</openerp>