All disbursements shall be made by order signed by the Mayor and the City Administrator, duly authorized by the Council, and every such order shall specify the purpose for which the disbursement is made and indicate that it is to be paid out of the proper fund. But no such order shall be paid until there is money to the credit of the fund out of which it is to be paid sufficient to pay the same together with all then outstanding encumbrances upon the fund. No claim against the city shall be allowed, except as otherwise provided in this title, unless accompanied by an itemized account and voucher, payroll or time sheet signed by a responsible officer who has personal knowledge of the facts in the case and certifies to the correctness and reasonableness of the claim and that it is a proper claim against the city; provided, however, that the Council may provide for a regular payment without specific individual authorization or filing of an itemized account and voucher, payroll or time sheet of the salaries and wages of regular employees or laborers and any other fixed charges which have been previously duly and regularly authorized.
(1998 Code, § 2.71)