Name: simulation/resources/dataelement.txt 
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<p>
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  The simulation is missing the value for a dataelement. There are three
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  reasons why this may occur:
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  <ol>
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    <li>
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      Processes are simulated individually. When they are spawned by a parent
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      process, the parent process may set some dataelements during the
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      instantiation (like a certain part id), that are missing now.
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    </li>
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    <li>
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      The business intelligence systems that provide forecasts for partner
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      gateways (tasks) may return only a subset of the values, that an actual
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      execution returns.
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    </li>
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    <li>
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      Gateways may not implement forecasts at all.
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    </li>
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  </ol>
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  All three cases leave tasks that depend on these dataelements hanging. In
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  order to noetheless gather useful information, the user can manually enter
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  subsitute values.
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</p>