Oregon Revised Statutes Human Services; Juvenile Code; Corrections § 419C.592

Any order for support entered pursuant to ORS 419C.590 is a judgment and is final as to any installment or payment of money which has accrued up to the time either party makes a motion to set aside, alter or modify the order, and the court does not have the power to set aside, alter or modify such order, or any portion thereof, which provides for any payment of money, either for minor children or the support of a party, which has accrued prior to the filing of such motion.