for paragraph (1)(c) there shall be substituted “ the Secretary of State revises the decision as to the maintenance calculation under section 16 of the Act and decides that no child support maintenance was payable on the ground that the previous decision was made in error, ”;

in paragraph (2)(aa) the words “is cancelled or” shall be omitted; and

in paragraph (2) the words “as not having been cancelled or, as the case may be,” shall be omitted.