Wis. Stat. § 858.05: Order to file inventory.

If any personal representative neglects to file the inventory under s. 858.01 when required by law, the court shall call the personal representative’s attention to the neglect. If the personal representative still neglects to file, the court shall order the personal representative to file the inventory. If, without reasonable cause shown, the personal representative refuses or neglects to comply with the order for 20 days after service of the order upon the personal representative, the personal representative may be held in contempt of court.