S. 263 : Commissioner-Revision of orders prejudicial to revenue-Appellate Tribunal-Power-Revision on ground pf lack of enquiry by Assessing Officer-When the Tribunal agreeing with Commissioner, the Tribunal has no power to set aside the order, when it’s is not subject matter of appeal. [S. 11, 12AA, 3(8), 80IB(10), 254(1)]