110 ILCS 805/7-16

The appropriation resolution or budget, including the amounts for the payment of contract liabilities or to defray the expense of any project or purpose, does not constitute an approval by the board of any liability or of any project or purpose mentioned, but shall be regarded only as the provisions for a fund or funds for the payment of legal obligations of the board, which amounts have been properly vouchered, audited and approved by or under authority of the board, or of any project or purpose that has been approved and authorized by the board, as the case may be.