[rules-users] Nullable Planning Variable

[newbie]

I am using 6.0.0CR5. I configure the planning variable to be null. Now using
the construction heuristic <constructionHeuristic>
    <constructionHeuristicType>FIRST_FIT</constructionHeuristicType>
    <forager>
      <pickEarlyType>FIRST_NON_DETERIORATING_SCORE</pickEarlyType>
    </forager>
  </constructionHeuristic>

all the planning entities was assigned with a planning variable even if the
assignment lead to a negative hard constraint. I assumed that some of it
will be assigned by null to avoid the negative hard constraint. Is my
assumption correct way of using the nullable planning varibale config?
Thanks.



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