An officer or unit of the State government may not spend money: in excess of the total appropriation to the officer or unit; or in excess of the amounts set forth in the current schedule for apportionment and disbursement of the appropriation. The State may not reimburse any expenditure to the extent that the expenditure violates subsection (a) of this section. The State is not obligated to appropriate money to pay an expenditure that violates subsection (a) of this section. Each employee or member of a unit and each officer of the State government who makes an expenditure that violates subsection (a) of this section is guilty of neglect of official duty and is subject to removal.