nota_remision_medicalart/nota_remision_sequence.xml

<?xml version="1.0" encoding="utf-8"?>
<openerp>
    <data noupdate="1">
        <!-- Sequences for sale.nota.remision -->
        <record id="seq_type_sale_nota_remision" model="ir.sequence.type">
            <field name="name">Sale Note Reference</field>
            <field name="code">sale.nota.remision</field>
        </record>

        <record id="seq_sale_nota_remision" model="ir.sequence">
            <field name="name">Sale Note Reference</field>
            <field name="code">sale.nota.remision</field>
            <field name="prefix">NR-</field>
            <field name="padding">5</field>
        </record>
    </data>
</openerp>