sale_sequence.xml

<?xml version="1.0" encoding="utf-8"?>
<openerp>
    <data noupdate="1">

        <!-- Sequences for sale.order -->
        <record id="seq_type_sale_order" model="ir.sequence.type">
            <field name="name">Sales_Order</field>
            <field name="code">sale.order</field>
        </record>

        <record id="seq_sale_order" model="ir.sequence">
            <field name="name">Sales_Order</field>
            <field name="code">sale.order</field>
            <field name="prefix">P/I.%(year)s.</field>
            <field name="padding">5</field>
            <field name="company_id" eval="False"/>
        </record>

        <record id="seq_type_delivery_order" model="ir.sequence.type">
            <field name="name">Delivery_Order</field>
            <field name="code">delivery.order</field>
        </record>
<!-- St. %(month)s/%(day)s/ -->
        <record id="seq_delivery_order" model="ir.sequence">
            <field name="name">Delivery_Order</field>
            <field name="code">delivery.order</field>
            <field name="prefix">DO.%(year)s.</field>
            <field name="padding">5</field>
            <field name="company_id" eval="False"/>
        </record>

        <!-- <record id="seq_sale_order" model="ir.sequence">
            <field name="name">Sales Order</field>
            <field name="code">sale.order</field>
            <field name="prefix">SO</field>
            <field name="padding">3</field>
            <field name="company_id" eval="False"/>
        </record> -->

    </data>
</openerp>