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  | Quintiq file version 2.0 
 |  #parent: #root 
 |  Function CalcDisplayIndex 
 |  { 
 |    TextBody: 
 |    [* 
 |      // ying ying Sep-25-2013 (created) 
 |       
 |      parentindex := guard( this.Parent().DisplayIndex(), 0 ); 
 |       
 |      previousindex := guard( this.PreviousRootUnit().DisplayIndex() + this.PreviousRootUnit().AllChildren( relsize ) - 1, 
 |                              guard( this.PreviousSiblingUnit().DisplayIndex() + this.PreviousSiblingUnit().AllChildren( relsize ) - 1, 0 ) ); 
 |       
 |      value := ifexpr( this.HasParent() and isnull( this.PreviousSiblingUnit() ), parentindex, previousindex ) + 1; 
 |       
 |      this.DisplayIndex( value ); 
 |    *] 
 |  } 
 |  
  |