A. The ONCSS shall initiate an income assignment, if not already established by a court order, at the earliest, on the date on which the payments which the obligor has failed to make under a child support order are at least equal to the support payable for one month and without regard to whether there is past-due support.

B. The income withholding shall occur without the need for any amendment to the support order involved or any other action by the court or ONCSS other than that required or permitted under the Osage Nation Child Support Code.

C. The payment of any support monies will not prevent an income assignment from taking effect.

D. The only basis for contesting a withholding under this section is a mistake of fact which means an error in the amount of current or overdue support or in the identity of the obligor.

E. When ONCSS initiates an income assignment, ONCSS shall send notice to the obligor that withholding has commenced. The notice shall contain the procedures necessary to contest the initiated income assignment.

F. If there is no contest to the initiated income withholding, ONCSS shall serve a copy of the order upon the obligor.

G. The order shall be a final judgment for purposes of an appeal.