A determination of the status of an employing unit by the department under AS 23.20.315 in the absence of appeal, and a final determination of the department upon an appeal, together with the record of the proceeding are admissible in a subsequent proceeding under this chapter. If the determination is supported by substantial evidence and there is no fraud, the determination is conclusive, except as to an error of law, upon an employing unit which is a party to the proceeding.