Okla. Stat. tit. 43, § 43-601-616: Registration of foreign child support orders -

Petition for modification.

A party or support enforcement agency seeking to modify or to

modify and enforce a foreign child support order not under the

Convention may register that order in this state under Sections 601-

601 through 601-608 if the order has not been registered. A

petition for modification may be filed at the same time as a request

for registration or at another time. The petition must specify the

grounds for modification.