nota_remision_medicalart/nota_remision_workflow.xml

<?xml version="1.0" encoding="utf-8"?>
<openerp>
    <data>
        <record id="wkf_nota" model="workflow">
            <field name="name">sale.nota.remision.basic</field>
            <field name="osv">sale.nota.remision</field>
            <field name="on_create">True</field>
        </record>

        <!-- Activity -->
        <record id="act_draft" model="workflow.activity">
            <field name="wkf_id" ref="wkf_nota"/>
            <field name="flow_start">True</field>
            <field name="name">draft</field>
        </record>

        <record id="act_progress" model="workflow.activity">
            <field name="wkf_id" ref="wkf_nota"/>
            <field name="flow_stop">True</field>
            <field name="name">progress</field>
            <field name="kind">function</field>
            <field name="action">write({'state':'progress'})</field>
        </record>

        <record id="trans_draf_progress" model="workflow.transition">
            <field name="act_from" ref="act_draft"/>
            <field name="act_to" ref="act_progress"/>
        </record>

    </data>
</openerp>