(a) General rule.--A tribunal of this State may not modify a convention child support order if the obligee remains a resident of the foreign country where the support order was issued unless one of the following occurs:
(1) The obligee submits to the jurisdiction of a tribunal of this State, either expressly or by defending on the merits of the case without objecting to the jurisdiction at the first available opportunity.
(2) The foreign tribunal lacks or refuses to exercise jurisdiction to modify the support order or issue a new support order.
(b) Order not recognized.--If a tribunal of this State does not modify a convention child support order because the order is not recognized in this State, section 77A08(c) (relating to recognition and enforcement of registered convention support order) applies.