(1)    Except as provided in sub. (3), a franchisor shall within 30 days after the happening of any material event affecting a registered franchise notify the division in writing, by an application to amend the registration statement, of any material change in the information contained in the application as originally submitted, amended or renewed. The division may by rule further define what shall be considered a material change for such purposes, and the circumstances under which a revised offering prospectus must accompany such application.

   (2)   An amendment filed after the effective date of the registration of the sale of franchises is effective upon receipt of the amendment by the division.

   (3)   If a franchisor and prospective franchisee in the offer or sale of a franchise negotiate changes to the terms or conditions of a franchise that is the subject of an effective registration statement, the franchisor is not required to amend the registration statement for purposes of that offer or sale. If the changes are material with respect to prospective franchisees who were not involved in negotiating the changes, the franchisor shall amend the registration statement under sub. (1) for purposes of offers or sales involving those prospective franchisees.