public function readTDTtransportIdentification($transportStageQualifier): string
    {
        $transportIdentification = $this->readEdiDataValue(['TDT', ['1' => $transportStageQualifier]], 8, 0);
        if (!empty($transportIdentification)) {
            return $transportIdentification;
        }

        return $this->readEdiDataValue(['TDT', ['1' => $transportStageQualifier]], 8);
    }