S. 147 : Reassessment-After the expiry of four years-Tribunal decided the issue in favour of assessee in earlier years-Order of Tribunal binding on the Assessing Officer though the matter is pending for admission before High Court-Re assessment notice based on the order of earlier years is bad in law-Assessing Officer cannot rely on assessment orders which are non existing because these orders have been held unjustified by the ITAT. [S. 143(1), 148, Art. 226]