S.147: Reassessment-After the expiry of four years- Export oriented undertaking —Mentioning of wrong year of commencement of manufacture in Form 56G, when other materials furnished indicated correct year of commencement of manufacture is not a case of failure to disclose material facts — The proviso to S. 147 cannot be invoked on the Assessing Officer’s omission or mistake- Reassessment notice is held to be not valid – Notice is not barred by limitation .[ S.10B,148 ]