foreach ($tblPersonList as $tblPerson) {
            $Entity = $Manager->getEntity('TblSerialPerson')
                ->findOneBy(array(
                    TblSerialPerson::ATTR_TBL_SERIAL_LETTER  => $tblSerialLetter->getId(),
                    TblSerialPerson::ATTR_SERVICE_TBL_PERSON => $tblPerson->getId(),