Fix InventoryCost error

yanyuan

2023-11-01 d82c813f4c07b13801a92fc20b3054d23a32ec58

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Quintiq file version 2.0
#parent: #root
Method DuplicateCombi () as OptCampaignCombi
{
  TextBody:
  [*
    combinew := this.DeepCopy().astype( OptCampaignCombi );
    combi := this.OptCampaignUnitSubPeriod().OptCampaignCombi( relinsert, &combinew ); 
    return combi;
  *]
}