Interest.

(a)

To the extent the court finds there are two or more conflicting orders with ongoing current support, the court shall determine the controlling order and consolidate arrears accrued under all valid orders. Upon determination of controlling order, the law of the jurisdiction that issued the controlling order governs the accrual of interest, if any.

(b)

After proper assumption of continuing, exclusive jurisdiction by a California tribunal of an order issued by another state or foreign country, the modified order shall accrue interest prospectively pursuant to California law. Any interest accrued at the time of modification shall be consolidated and enforced, upon request.