Wis. Stat. § 767.331
If a spouse has begun an action against the other spouse under s. 766.70 and either or both spouses subsequently bring an action under this chapter for divorce, annulment or legal separation, the actions may be consolidated by the court exercising jurisdiction under this chapter. If the actions are consolidated, to the extent the procedural and substantive requirements of this chapter conflict with the requirements under s. 766.70 , this chapter controls. No action under s. 766.70 may be brought by a spouse against the other spouse while an action for divorce, annulment or legal separation is pending under this chapter.
Wis. Stat. § 767.331
The prohibition under sub. (7) [now s. 767.331] of commencing an action under s. 766.70 while a divorce, annulment, or legal separation action is pending is constitutional. Haack v. Haack, 149 Wis. 2d 243, 440 N.W.2d 794 (Ct. App. 1989).