S. 254(1) : Appellate Tribunal-Powers-Additional grounds-Issue not raised before the Commissioner (Appeals)-Reassessment-Validity-Application made as per Income-Tax (Appellate Tribunal) Rules, 1963, Rule 27 the was admitted-Reassessment order was quashed. [S. 147, 148, Income-Tax (Appellate Tribunal) Rules, 1963, Rule 27]