Fix InventoryCost error

yanyuan

2023-11-01 d82c813f4c07b13801a92fc20b3054d23a32ec58

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Quintiq file version 2.0
#parent: #root
Function CalcIsInHour
{
  TextBody:
  [*
    // nicklausy Oct-14-2016 (created)
    value := guard( this.PeriodSpecification_MP().IsInHour(), false );
    
    this.IsInHour( value );
  *]
}