procurement_workflow.xml

<?xml version="1.0"?>
<openerp>
  <data>

    <record model="workflow.transition" id="trans_direct_confirm_to_wait_services">
      <!-- Duplicates the transition between the act_confirm and act_confirm_wait activites
           but, this time, without the signal and only for services -->
      <field name="act_from" ref="procurement.act_confirm"/>
      <field name="act_to" ref="procurement.act_confirm_wait"/>
      <field name="condition">check_conditions_confirm2wait() and is_service()</field>
    </record>

  </data>
</openerp>