Deeming provision for erroneous assessment orders: specified grounds render an Assessing Officer's order erroneous and prejudicial to revenue. An amendment adds an Explanation declaring an Assessing Officer's order deemed to be erroneous and prejudicial to the interests of the revenue where the Principal Commissioner or Commissioner opines that the order was passed without required inquiries or verification; allowed relief without inquiry; did not follow any Board order, direction or instruction; or did not follow any decision adverse to the assessee rendered by the jurisdictional High Court or Supreme Court.