S.147: Reassessment-After the expiry of four years- Mutual association – Interest from fixed deposits- A subsequent decision of the Supreme Court reversing the legal position existing at the time of passing of the assessment order could not be called an omission or failure on the part of the assessee to disclose fully and truly the material fact necessary for the relevant assessment- No failure to disclose material facts – Reassessment notice is held to be bad in law [ S. 4, 148 ]