Wis. Stat. § 421.103: Applicable law.

(1) Unless superseded by the particular provisions of chs. 421 to 427, chs. 401 to 411 and the principles of law and equity, including the law relative to capacity to contract, principal and agent, estoppel, fraud, misrepresentation, duress, coercion, mistake, bankruptcy, or other validating or invalidating cause supplement chs. 421 to 427.

(2) Unless terms used in chs. 421 to 427 are defined by particular provisions of chs. 421 to 427, they shall have the meaning given them in chs. 401 to 411 and 429, if they are defined in chs. 401 to 411 and 429.

(3) Unless superseded by the particular provisions of chs. 421 to 427 parties to a consumer transaction have all of the obligations, duties, rights and remedies provided in chs. 401 to 411 which apply to the transaction.

(4) Chapters 421 to 427 shall not preempt the administration or enforcement of ch. 100. Conduct proscribed under s. 423.301, 426.108, 426.109 or 426.110 may also constitute violations of s. 100.18 or 100.20.