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  | Quintiq file version 2.0 
 |  #parent: #root 
 |  Function CalcHistoricalDuration 
 |  { 
 |    TextBody: 
 |    [* 
 |      // DWE2 Apr-29-2016 (created) 
 |       
 |      value := Duration::Zero(); 
 |       
 |      if( this.IsHistorical() 
 |          or this.IsPartialHistorical() ) 
 |      { 
 |        value := this.MacroPlan().StartOfPlanning() - this.Start(); 
 |      } 
 |       
 |      this.HistoricalDuration( value ); 
 |    *] 
 |  } 
 |  
  |