As much of the moneys, from time to time, standing to the credit of the school district income tax account of the State School Fund, as may be necessary, is hereby appropriated to the department for the purpose of making refunds as herein authorized. Estimates of the amounts to be expended from this account for refunds, from time to time, by the department shall be submitted to the Governor for his approval or disapproval as in the case of other appropriations to administrative departments, boards, and commissions; and it shall be unlawful for the Auditor General to honor any requisition of the department for the expenditure of moneys hereunder in excess of the estimates approved by the Governor.
72 P.S. § 3402-502