Neb. Rev. Stat. § 42-734.05

(a) 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 sections 42-736 to 42-747.04 or otherwise contesting the order in the same manner as if the order had been issued by a tribunal of this state. (b) The obligor shall give notice of the contest to: (1) a support enforcement agency providing services to the obligee; (2) each employer that has directly received an income withholding order relating to the obligor; and (3) the person designated to receive payments in the income withholding order or, if no person is designated, to the obligee.