S. 147 : Reassessment-After expiry of four years-Scrutiny assessment-Where original assessment was completed after a detailed scrutiny of the assessee’s share transactions, a subsequent reopening of assessment on the same issue based on information regarding ‘client code modification’ is invalid, as there was no failure on the part of the assessee to disclose material facts fully and truly. [S. 68,143(3), 148, Art. 226]