S. 147 : Reassessment-Double taxation avoidance agreements-Tax Residency Certificate granted by another country-Binding on Income-Tax Authorities in India-Notice of reassessment is not valid-DTAA-India-Singapore-Notice issued in SLP filed by the Revenue-SLP granted to the Revenue. [S. 90(2), 133(6), 148, Art. 13(4) Art. 136]