The fund commissioners, at the times provided by law before any state bonds or interest thereon becomes due, shall requisition the amount necessary to pay the bonds or interest and the necessary expenses to be incurred in transmitting the moneys; whereupon the commissioner of administration shall certify the amount and a warrant shall be issued upon the state treasury payable out of the current appropriation made by the general assembly for the payment of the bonds and interest. If there is not sufficient money in the treasury belonging to the fund to pay the warrant, then the deficiency shall be paid out of any other moneys in the treasury belonging to the general revenue fund. The warrant shall be delivered to the state treasurer, who shall transmit the amount of money therein specified to the state’s fiscal agent, with instructions to place the money to the credit of the board of fund commissioners for payment of interest, or principal, of the bonded indebtedness of the state.