The supreme court may answer questions of law certified to it by the supreme court of the United States, a court of appeals of the United States or the highest appellate court of any other state when requested by the certifying court if there are involved in any proceeding before it questions of law of this state which may be determinative of the cause then pending in the certifying court and as to which it appears to the certifying court there is no controlling precedent in the decisions of the supreme court and the court of appeals of this state.
Wis. Stat. § 821.01