S. 153A : Assessment-Search or requisition-No notice u/s. 143(2) was issued after filing of return-Assessment was not invalid-Commissioner being supervisory authority, can issue administrative direction to Assessing Officer-Un explained investment-Addition can be made only in the year in which the investment was made-Assessing Officer cannot make the addition in the year of his choice-Swiss Bank-Base sheet-Authenticity of information not established-Addition as unexplained investment and addition on deposit is held to be not sustainable-Completed assessment-No addition can be made in the absence of incriminating material found in the course of search-Merely on the basis of statement u/s 132(4), addition cannot be made-Marriage expenses-Withdrawal from bank-Deletion of addition is held to be justified. [S. 69, 132, 143(2), 153D]