(1) Except as provided below in subsections (2) and (3) of this section, confirmation of a registered order precludes further contest of the order with respect to any matter that could have been asserted at the time of registration. Confirmation may occur:

(a) By operation of law upon failure to contest registration; or

(b) By order of the administrative law judge (ALJ).

(2) Confirmation of a registered order that does not include interest does not relieve the noncustodial parent (NCP) of any interest that may have accrued or may accrue under the confirmed order.

(a) If interest is later assessed, the NCP or the custodial parent (CP) may not dispute the confirmed amount of the support debt.

(b) The NCP or CP may dispute the amount of interest due and owing on that confirmed amount by requesting a conference board under WAC 388-14A-6400.

(3) Confirmation of a registered order that does include interest confirms only the amount of debt, including interest, that is due and owing for the indicated time periods. Such confirmation does not relieve the NCP of any interest that may have accrued or may accrue for any other time period.