After filing the documents listed in WAC 434-379-005, a copy of the documents is sent to the code reviser. The code reviser shall issue a certificate of review certifying that he or she has reviewed the measure and that any recommendations have been communicated to the sponsor. Within fifteen working days after the date that the secretary of state submits the proposed measure to the code reviser's office, the sponsor shall file the measure and the certificate of review with the secretary of state for assignment of a serial number. The secretary of state shall refuse to make such assignment unless the measure is accompanied by a certificate of review that has substantially the same topic as the measure.