23 Pa.C.S. § 7609: Procedure to register child support order of another state for modification.

A party or support enforcement agency seeking to modify or to modify and enforce a child support order issued in another state must register that order in this State in the same manner provided in Subchapter A (relating to registration for enforcement of support order) or B (relating to contest of validity or enforcement) if the order has not been registered. A petition for modification may be filed at the same time as a request for registration or later. The pleading must specify the grounds for modification.