(1) If, in an Appropriation Act, an amount is specified opposite an item in the Schedule to that Act as estimated expenditure on that item and the Treasurer is of the opinion that the amount is deficient, the Treasurer may make good the deficiency out of any surplus arising, or saving effected, in relation to another item specified in that Schedule.(2) The Public Account is, without further or other appropriation, appropriated to the extent necessary to provide an amount mentioned in subsection (1) .