Wis. Stat. § 769.506
Sub. (1) is amended 2009 Wis. Act 321 effective the date stated in the notice published in the Wisconsin Administrative Register under s. 769.904 to read:
(1) An obligor may contest the validity or enforcement of an income-withholding order issued in another state and received directly by an employer in this state by registering the order in a tribunal of this state and filing a contest to that order as provided in subch. VI, or otherwise contesting the order in the same manner as if the order had been issued by a tribunal of this state. Section 769.604 applies to the contest.