(2) A stipulated or default order of modification must be filed in the county and case where the initial APA order was filed.
(3) In appropriate cases, the delegate child support enforcement unit shall transmit data elements of the order, return of service of process, and other APA documents to the clerk of the court in the county where the notice of financial responsibility was issued in lieu of filing the order and other documents with the court.
(4) When the original order is not filed with the court, the delegate child support enforcement unit shall be the custodian of the record until the order is filed with the court.
(5) This section applies to both establishment and modification cases.