(a) A member of the Defined Benefit Program who is employed by an employer on a full-time basis to perform creditable service subject to coverage under the Defined Benefit Program, may participate in the Cash Balance Benefit Program for creditable service performed for a different employer if the different employer provides the Cash Balance Benefit Program and would otherwise contribute to social security or an alternative retirement plan on behalf of the member for that service. (b) This section shall become inoperative on July 1, 2002, and, as of January 1, 2003, is repealed, unless a later enacted statute, that becomes operative on or before January 1, 2003, deletes or extends the dates on which it becomes inoperative and is repealed.