S. 254(1) : Appellate Tribunal- Duties-CIT(A) decided the appeal on merits-Revision by the Commissioner-It was incumbent upon Tribunal to have decided appeal on merits rather than finding that the assessee ought to have questioned under section 263 in a separate proceedings-Order of Tribunal set aside to decide for fresh consideration. [S. 115JB,253, 263, 250, 260A]