S. 254(2): Appellate Tribunal-Rectification of mistake apparent from the record-Once the Tribunal had partly allowed the appeal by order dated 21-9-2011 and had directed adoption of 5 per cent profit ratio by modifying the assessment order, the Tribunal was not within its power to re-adjudicate issues and determine estimated income in the hands of the assessee afresh.[S. 254(1), 260A]