odoo_source/addons/purchase_requisition/purchase_requisition_sequence.xml

<?xml version="1.0" encoding="utf-8"?>
<openerp>
    <data noupdate="1">
        <!-- Sequences for purchase.order --> 
        <record id="seq_type_purchase_requisition" model="ir.sequence.type">
            <field name="name">Purchase Requisition Order</field>
            <field name="code">purchase.order.requisition</field>
        </record>
        <record id="seq_purchase_requisition" model="ir.sequence">
            <field name="name">Purchase Requisition Order</field>
            <field name="code">purchase.order.requisition</field>
            <field name="prefix">TE</field>
            <field name="padding">5</field>
        </record>
    </data>
</openerp>