State set-aside assignments shall generally be issued through the prime supplier with whom the applicant has an established base period supply volume. In exceptional cases, the office may order assignments through alternate prime suppliers or may split assignments between prime suppliers. When assignments are made to a retail gasoline outlet from a supplier other than the supplier associated with the outlet's brand name, the applicant shall comply with RCW 9.16.080 and shall post a disclaimer to the effect that the product sold is not the brand usually associated with the outlet.