Okla. Stat. tit. 43, § 43-601-607: Contest of registration or enforcement

A. A party contesting the validity or enforcement of a

registered support order or seeking to vacate the registration has

the burden of proving one or more of the following defenses:

1. The issuing tribunal lacked personal jurisdiction over the

contesting party;

2. The order was obtained by fraud;

3. The order has been vacated, suspended, or modified by a

later order;

4. The issuing tribunal has stayed the order pending appeal;

5. There is a defense under the law of this state to the remedy

sought;

6. Full or partial payment has been made;

7. The statute of limitation under Section 601-604 of this

title precludes enforcement of some or all of the alleged

arrearages; or

8. The alleged controlling order is not the controlling order.

B. If a party presents evidence establishing a full or partial

defense under subsection A of this section, a tribunal may stay

enforcement of a registered support order, continue the proceeding

to permit production of additional relevant evidence, and issue

other appropriate orders. An uncontested portion of the registered

support order may be enforced by all remedies available under the

law of this state.

C. If the contesting party does not establish a defense under

subsection A of this section to the validity or enforcement of a

registered support order, the registering tribunal shall issue an

order confirming the order.