S. 147 : Reassessment-After the expiry of four years-Failure to issue notice u/s 143(2)-Error in Form 10CCB regarding date of commencement of production-Date of grant of licence cannot normally be date of commencement of business –Mistake of Chartered Accountant in the Form No 10CCB-No failure to make true and full disclosure-Extended limitation of 6 years not available-Reassessment notice quashed. [S. 80IB, 143(2), 143(3),148, Form 10CCB, Art. 226]