S. 147 : Reassessment-After the expiry of four years-Capital gains-Authority for Advance ruling-Ruling would apply and be binding only on applicant-Subsequent ruling on other assessee cannot be the basis for reopening of the assessment-DTAA-India-UAE [S. 9(1)(i), 148, 245R, 245S, Art. 4, 10, 11. 13(3)]