A municipality shall not incur expenditures nor obligate the municipality to expend unbudgeted amounts in excess of one hundred thousand dollars ($100,000) without first notifying the city or town council of such proposed expenditure and identifying the source of funding. Further, a school committee or school department shall not incur accumulated unbudgeted expenditures or obligations in excess of one hundred thousand dollars ($100,000) without first notifying the chief financial officer of the municipality as to the proposed expenditure and identifying the source of funding. The financial officer shall include any such proposed expenditure in the monthly report required in § 45-12-22.2.