Any power exercisable by the Comptroller and Auditor-General under the provisions of this Act, or any other law may be exercised by such officer of his department as may be authorised by him in this behalf by general or special order:
     Provided that except during the absence of the Comptroller and Auditor-General on leave or otherwise, no officer shall be authorised to submit on behalf of the Comptroller and Auditor-General any report which the Comptroller and Auditor-General is required by the Constitution or the Government of Union Territories Act, 1963 (20 of 1963) to submit to the President or the Governor of a State or the Administrator of a Union territory having a Legislative Assembly, as the case may be.