title: How to use multiple conditions in Openerp workflow transitions?
body: <p>I am currently working on hr_holidays work-flow and I need to call a sub flow according to multiple conditions in one transitions. This is what I have written so far.</p>
  
  <p>Flag fields from <strong>hr_holidays</strong> class</p>
  
  <pre><code> #flags for use workflow in different levels
          'flag_sub':fields.boolean('Substitute'),
          'flag_manager':fields.boolean('Manager'),
          'flag_gm':fields.boolean('GM'),
  </code></pre>
  
  <p>Transition from <strong>hr_holidays_workflow.xml</strong></p>
  
  <pre><code>&lt;record model="workflow.transition" id="holiday_confirm2validate"&gt; &lt;!-- 2. submitted-&gt;accepted (validate signal) if not double_validation--&gt;
          &lt;field name="act_from" ref="act_confirm" /&gt;
          &lt;field name="act_to" ref="act_new_validate1" /&gt;
          &lt;field name="signal"&gt;validate&lt;/field&gt;
          &lt;field name="condition"&gt;**not sub_flag and not flag_manager and not flag_gm**&lt;/field&gt;
          &lt;field name="group_id" ref="base.group_hr_user"/&gt;
      &lt;/record&gt;
  </code></pre>
  
  <p>Please help me with writing these conditions</p>