This section is amended by 2009 Wis. Act 321 effective the date stated in the notice published in the Wisconsin Administrative Register under s. 769.904 to read:

769.609 Procedure to register child support order of another state for modification. A party or support enforcement agency seeking to modify, or to modify and enforce, a child support order issued in another state shall register that order in this state in the same manner as provided in ss. 769.601 to 769.608 if the order has not been registered. A petition for modification may be filed at the same time as a request for registration, or later. The pleading must specify the grounds for modification.