Wis. Stat. § 67.26: Judgments on municipal orders.

No judgment shall be rendered in any action brought upon any county, town, city, village or school order, unless the order upon which said action is based is produced in evidence and filed with the court or with the clerk thereof, and the clerk notes upon each order the date of such filing. Any order so filed shall not be removed from the files without an order of the court or presiding judge. Any judgment rendered in violation of this section shall be absolutely void.