Wis. Admin. Code Employment Relations Commission ERC 12.08
Within 20 days from the date findings of fact, conclusions of law and order are issued, they may be set aside, modified, changed or reversed by the commission or examiner if any mistake is discovered in the decision or on grounds of newly discovered evidence, provided that no petition for review of an examiner's findings, conclusions and order has been filed with the commission. If within that 20 day period no order is issued setting aside, modifying, changing or reversing the findings of fact, conclusions of law and order and no petition for review of an examiner's findings, conclusions and order has been filed, then the examiner's findings, conclusions and order shall become the commission's by operation of law under s. 111.07(5), Stats.
Wis. Admin. Code Employment Relations Commission ERC 12.08