(a) An obligor and obligee may agree to reduce or terminate income withholding for spousal maintenance on the occurrence of any contingency stated in the order.
(b) The obligor and obligee may file a notarized or acknowledged request with the clerk of the court under Section 8.108 for a revised writ of withholding or notice of termination of withholding.
(c) The clerk shall issue and deliver to the obligor's employer a writ of withholding that reflects the agreed revision or a notice of termination of withholding.
(d) An agreement by the parties under this section does not modify the terms of an order for spousal maintenance.