Wis. Stat. § 63.13
No payment for personal services of any officer or employee in the classified service of any county wherein ss. 63.01 to 63.16 are applicable shall be made by any county officer unless the commission has certified that the officer or employee claiming such payment is holding a position legally under the provisions of said ss. 63.01 to 63.16 and the rules of the commission. Such certification shall be required on each and every payroll for each and every office and position in the county service, which is subject to the provisions of said ss. 63.01 to 63.16. County officers making payments in violation of this section shall be liable for the full amount thus paid and shall be deemed guilty of a violation of the provisions of said ss. 63.01 to 63.16, and subject to the penalties provided in s. 63.17.
Wis. Stat. § 63.13