Any person aggrieved by a final order of the commission may, within 20 days after service of the order, file a written petition for rehearing which shall specify in detail the grounds for the relief sought and supporting authorities. Practice and procedure regarding the filing and processing of a petition for rehearing in a referendum proceeding shall be as set forth in s. ERC 18.11.
Wis. Admin. Code Employment Relations Commission ERC 15.15