With the prior approval of the commissioner, a waivered cooperative may require all participating carriers to apply allowable rate adjustment factors and case characteristic factors to all of that waivered cooperative's business in a consistent fashion, as determined by the cooperative. If a waivered cooperative has received such approval, a participating carrier within that cooperative shall not be required to apply allowable rate adjustment factors and case characteristic factors in the same way for its waivered cooperative business as for its other business.