Wis. Stat. § 63.45
No treasurer, auditor, comptroller, other officer or employee of the city in which ss. 63.18 to 63.53 are effective shall approve the payment of or be in any manner concerned in paying, auditing or approving any salary, wage or other compensation for services, to any person in the classified service unless a payroll, estimate, or account for such salary, wage or other compensation, containing the names of persons to be paid, a statement of the amount to be paid each such person, the services on account of which the same is paid, bears the certificate of the commission that the persons named in such payroll, estimate, or account have been appointed or employed in pursuance of and have complied with ss. 63.18 to 63.53 and with the rules of the commission, and that the rate of salary or wage is in accordance with the rate established by the proper authorities. The commission shall refuse to certify the pay of any public officer or employee who shall willfully or through culpable negligence violate or fail to comply with ss. 63.18 to 63.53 or the rules of the commission. The city service commission shall certify to the city comptroller all appointments to offices and places in the office of the city service commission and all changes or vacancies that may occur therein.
Wis. Stat. § 63.45