S. 153A : Assessment-Search or requisition-Total income-Completed Assessments remain unabated-No addition permissible for such years in absence of incriminating material having been found in search-Completed or unabated assessments can be reopened under Section 147 or 148 of the Act. [S. 2(45), 131, 132, 132A, 143(1), 143(3), 147, 148,285BA]