cnab_workflow.xml

<?xml version="1.0" encoding="utf-8"?>
<openerp>
    <data>
        <record id="wkf" model="workflow">
            <field name="name">cnab.basico</field>
            <field name="osv">cnab.cnab</field>
            <field name="on_create">True</field>
        </record>

        <record id="act_draft" model="workflow.activity">
            <field name="wkf_id" ref="wkf"/>
            <field name="name">draft</field>
            <field name="flow_start">True</field>
            <field name="action">write({'state':'draft'})</field>
            <field name="kind">function</field>
        </record>

        <record id="act_lancado" model="workflow.activity">
            <field name="wkf_id" ref="wkf"/>
            <field name="name">lancado</field>
            <field name="action">write({'state':'done'})</field>
            <field name="kind">function</field>
        </record>


        <record id="t1" model="workflow.transition">
            <field name="act_from" ref="act_lancado"/>
            <field name="act_to" ref="act_draft"/>
            <field name="signal">draft</field>
        </record>
        <record id="t2" model="workflow.transition">
            <field name="act_from" ref="act_draft"/>
            <field name="act_to" ref="act_lancado"/>
            <field name="signal">lancar</field>
        </record>
    </data>
</openerp>