RULE approval_requires_approval_date_time

(* SCHEMA process_planning_schema; *)

  RULE approval_requires_approval_date_time FOR (approval, 
             approval_date_time);

  WHERE
    wr1: SIZEOF(QUERY ( app <* approval | (NOT (SIZEOF(QUERY ( adt <* 
             approval_date_time | (app :=: adt.dated_approval) )) = 1)) )) 
             = 0;

  END_RULE; -- approval_requires_approval_date_time

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2012-03-27T17:19:47-04:00