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  | Quintiq file version 2.0 
 |  #parent: #root 
 |  DeclarativeReferenceRelation CalcPlanningPeriod 
 |  { 
 |    #keys: '1[133004.0.163492865]' 
 |    Expression: 
 |    [* 
 |      planningperiod := null( Period_MP ); 
 |       
 |      if( this.IsBase() ) 
 |      { 
 |        planningperiod := select( this.MacroPlan(), PlanningPeriod, period, 
 |                                 this.IsInPeriod( period.Start(), period.End() ) ); 
 |      } 
 |       
 |      return planningperiod; 
 |    *] 
 |    Relation: PlanningPeriod 
 |  } 
 |  
  |