S.C. Code § 9-18-100
A domestic relations order accepted by the retirement system before July 1, 1995, must be administered by the retirement system in accordance with the provisions of the order and must not be rereviewed by the system for compliance with Section 9-18-20 unless the system is requested to do so by the court having jurisdiction over the matter. The retirement system, however, in its sole discretion, may require that any amendment of an accepted order that is received after June 30, 1995 meet the requirements of Section 9-18-20. For purposes of this section, an order is an "accepted order" only if the retirement system provided before July 1, 1995, written notice of its acceptance of the order to the member or retired member, and the alternate payee.
S.C. Code § 9-18-100