(1) Every member or subscriber to a rating organization shall adhere to the filings made on its behalf by such organization. Deviations from the organization's filings are permitted only when filed with the commissioner in accordance with this chapter.
(2) Every such deviation shall terminate upon a material change of the basic rate from which the deviation is made. The commissioner shall determine whether a change of the basic rate is so material as to require such termination of deviations.