If a registered producer and a beer wholesaler licensed by the State at the time that they were engaged in the shipment and receipt of malt beverages intended for sale in the State on May 1, 1974, and the shipment and receipt is continued until April 1, 1974, the limitations on the cancellation or termination of an agreement or contract, written or oral, franchise, or contractual franchise relationship provided in § 61-4-1100(1)(b) and in § 61-4-1100(2)(b) are applicable with respect to the shipment and receipt of the malt beverages, so that neither the registered producer nor the beer wholesaler has the right to discontinue the shipment and receipt except under the conditions specified in those subsections.