Be it enacted by the Senate and House of Representatives in General Court assembled, and by the authority of the same, as follows:

SECTION 1. Section 6 of chapter 418 of the acts of 1890 is hereby amended by striking out the first sentence, as most recently amended by section 1 of chapter 373 of the acts of 1992, and inserting in place thereof the following sentence:- All contracts made by any department of the city of Boston or by any officer, board or official of the county of Suffolk having power to incur obligations on behalf of said county in cases where said obligations are to be paid for wholly from the treasury of said city, shall, when the amount involved is $10,000 or more, or when the contract comes within section 30 of chapter 486 of the acts of 1909, be in writing; and no such contract shall be deemed to have been made or executed until the approval of the mayor of said city has been affixed thereto in writing and the auditor of said city has certified thereon that an appropriation is available therefor or has cited thereon the statute under authority of which the contract is being executed without an appropriation.

SECTION 2. Section 24 of chapter 486 of the acts of 1909 is hereby repealed.

SECTION 3. This act shall take effect upon its passage.