(1) The Principal Commissioner or the Commissioner may, for the purposes of revising any order passed in any proceeding under this Act before any tax authority subordinate to him, call for and examine all available records relating thereto.
     (2) The Principal Commissioner or the Commissioner may, after giving the assessee an opportunity of being heard, pass an order (hereinafter referred to as the revision order) as the circumstances of the case justify, if he is satisfied that the order sought to be revised is erroneous in so far as it is prejudicial to the interests of the revenue.
     (3) The Principal Commissioner or the Commissioner may make, or cause to be made, such inquiry as he considers necessary for the purposes of passing an order under sub-section (2).
     (4) The revision order passed by the Principal Commissioner or the Commissioner under sub-section (2) may have the effect of enhancing or modifying the assessment but shall not be an order cancelling the assessment and directing a fresh assessment.
     (5) The power of the Principal Commissioner or the Commissioner under sub-section (2) for revising an order shall extend to such matters as have not been considered and decided in any appeal.
     (6) No order under sub-section (2) shall be made after the expiry of a period of two years from the end of the financial year in which the order sought to be revised was passed.
     (7) Notwithstanding anything in sub-section (6), an order in revision under this section may be passed at any time in respect of an order which has been passed in consequence of, or to give effect to, any finding or direction contained in an order of the Appellate Tribunal, the High Court or the Supreme Court.
     (8) In computing the period of limitation under sub-section (6), the following shall not be included, namely:—
         (a) the time taken in giving an opportunity to the assessee to be reheard under section 7; or
         (b) any period during which any proceeding under this section is stayed by an order or injunction of any court.
     (9) Without prejudice to the generality of the foregoing provisions, an order passed by a tax authority shall be deemed to be erroneous in so far as it is prejudicial to the interests of the revenue, if in the opinion of the Principal Commissioner or the Commissioner—
         (a) the order is passed without making inquiries or verification which, should have been made; or
         (b) the order has not been made in accordance with any order, direction or instruction issued by the Board; or
         (c) the order has not been passed in accordance with any decision, prejudicial to the assessee, rendered by the jurisdictional High Court or the Supreme Court in the case of the assessee or any other person under this Act or the Income-tax Act.
     (10) In this section, "record" shall include all records relating to any proceeding under this Act available at the time of examination by the Principal Commissioner or the Commissioner.