Fix InventoryCost error

yanyuan

2023-11-01 d82c813f4c07b13801a92fc20b3054d23a32ec58

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Quintiq file version 2.0
#parent: #root
Function CalcParentFrozenFutureDuration
{
  TextBody:
  [*
    // gan dickson Nov-9-2016 (created)
    value := guard( this.Parent().FrozenFutureDuration(), Duration::Zero() );
    this.ParentFrozenFutureDuration( value );
  *]
}