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  | Quintiq file version 2.0 
 |  #parent: #root 
 |  DeclarativeReferenceRelation CalcLeadOperationOutput 
 |  { 
 |    #keys: '1[136770.0.134531241]' 
 |    Expression: 
 |    [* 
 |      lead := guard( this.PreviousOutputNodeOfRoutingStep().LeadOperationOutput(), null( OperationOutput ) ); 
 |       
 |      if( this.IsLead() ) 
 |      { 
 |        lead := this; 
 |      } 
 |       
 |      return lead; 
 |    *] 
 |    Relation: LeadOperationOutput 
 |  } 
 |  
  |