S.C. Code Ann. § 20-7-1152 – Conditions warranting modification of support order of another state; nonmodifiable aspects of order; jurisdiction

(A) After a child support order of another state has been registered in this State, unless Section 20-7-1154 applies, the responding tribunal of this State may modify that order only if, after notice and hearing, it finds that:
1. (1) these requirements are met:
  1. (a) the child, the individual obligee, and the obligor do not reside in the issuing state;
  2. (b) a plaintiff who is a nonresident of this State seeks modification; and
  3. (c) the defendant is subject to the personal jurisdiction of a tribunal of this State; or
2. (2) an individual party or the child is subject to the personal jurisdiction of a tribunal of this State and all the parties have filed a written consent in the issuing tribunal providing that a tribunal of this State may modify the support order and assume continuing, exclusive jurisdiction over the order. However, if the issuing state is a foreign jurisdiction which has not enacted this subarticle, the written consent of the individual party residing in this State is not required for the tribunal to assume jurisdiction to modify the child support order.
(B) Modification of a registered child support order is subject to the same requirements, procedures, and defenses that apply to the modification of an order issued by a tribunal of this State and may be enforced and satisfied in the same manner.
(C) A tribunal of this State may not modify any aspect of a child support order that may not be modified under the law of the issuing state. If two or more tribunals have issued child support orders for the same obligor and child, the order that is controlling and must be recognized under Section 20-7-1010 establishes the nonmodifiable aspects of the support order.
(D) On issuance of an order modifying a child support order issued in another state, a tribunal of this State becomes the tribunal of continuing, exclusive jurisdiction.