(5) The Tribunal may after giving both parties to the appeal an opportunity of being heard, pass such orders thereon, as it thinks fit and shall communicate any such orders to the assessee and to the Commissioner in such manner as may be prescribed." Section 30 confers power of revision in the Board of Revenue: and is to the following effect : (1) The Board of Revenue may, either on its own motion or on application made by the assessee in this behalf, call for and examine the records of any proceeding under this Act (not being a proceeding in respect of which an appeal lies to the Tribunal under section 20) to satisfy, itself as to the regularity of such proceeding or the correctness, legality or propriety of any decision or order passed therein and if, in any case, it appears to the Board of Revenue that any such decision or order should be modified, annulled, reversed or remitted for reconsideration, it may pass orders accordingly : Provided that the Board of Revenue shall not pass any order under this subsection in any case, where the decision or order is sought to be revised by the Board of Revenue on its own motion, if such decision or order had been made more than three years previously : Provided further that the Board of Revenue shall not pass any order under this section prejudicial to any 276 party unless he has had a reasonable opportunity of making his representations.