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    when<br>
    &nbsp; TaskAssignment($person, $taskType, $period1)<br>
    &nbsp; TaskAssignment(same $person, same $taskType, earlier than
    $period1, $period2)<br>
    &nbsp; not TaskAssingment(same $person, same $taskType, earlier than
    $period1, later period than $period2)<br>
    <br>
    <br>
    <div class="moz-cite-prefix">Op 04-12-12 17:40, Michiel Vermandel
      schreef:<br>
    </div>
    <blockquote
      cite="mid:1354639226.42067.YahooMailNeo@web161302.mail.bf1.yahoo.com"
      type="cite">
      <div style="color:#000; background-color:#fff; font-family:tahoma,
        new york, times, serif;font-size:10pt">
        <div><span>Hi,</span></div>
        <div style="color: rgb(0, 0, 0); font-size: 13.3333px;
          font-family: tahoma,new york,times,serif; background-color:
          transparent; font-style: normal;"><br>
          <span></span></div>
        <div style="color: rgb(0, 0, 0); font-size: 13.3333px;
          font-family: tahoma,new york,times,serif; background-color:
          transparent; font-style: normal;"><span>In my usecase I need
            to plan tasks (PlanningEntity).</span></div>
        <div style="color: rgb(0, 0, 0); font-size: 13.3333px;
          font-family: tahoma,new york,times,serif; background-color:
          transparent; font-style: normal;"><span>I have two kinds of
            tasks (for example CleaningTask and InspectionTask (inspect
            that cleaning was OK)).</span></div>
        <div style="color: rgb(0, 0, 0); font-size: 13.3333px;
          font-family: tahoma,new york,times,serif; background-color:
          transparent; font-style: normal;">Each task<span> needs to be
            assigned to a person and a period.</span></div>
        <div style="color: rgb(0, 0, 0); font-size: 13.3333px;
          font-family: tahoma,new york,times,serif; background-color:
          transparent; font-style: normal;"><span>Person and period both
            are PlanningVariables.</span></div>
        <div style="color: rgb(0, 0, 0); font-size: 13.3333px;
          font-family: tahoma,new york,times,serif; background-color:
          transparent; font-style: normal;"><span><br>
          </span></div>
        <div style="color: rgb(0, 0, 0); font-size: 13.3333px;
          font-family: tahoma,new york,times,serif; background-color:
          transparent; font-style: normal;"><span>I need to ensure that
            a person does not execute an </span><span><span>InspectionTask</span>
            twice in a row.</span></div>
        <div style="color: rgb(0, 0, 0); font-size: 13.3333px;
          font-family: tahoma,new york,times,serif; background-color:
          transparent; font-style: normal;"><span>How can I find out
            what the previous task is that is assigned to a person?</span></div>
        <div style="color: rgb(0, 0, 0); font-size: 13.3333px;
          font-family: tahoma,new york,times,serif; background-color:
          transparent; font-style: normal;"><span>It is not guaranteed
            that the person had a task in the previous period
            (period-1).</span></div>
        <div>&nbsp;<br>
          Thanks,<br>
          <br>
          Michiel<br>
        </div>
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