Wis. Stat. § 138.02: Contracts not affected.

Nothing contained in s. 138.01 shall vitiate or affect any account, charge or entry originally made or any note, bond or other instrument expressed in any other money of account; but, except as provided in ss. 806.30 to 806.44, the same shall be reduced to dollars or parts of a dollar as hereinbefore directed in any suit thereupon.