S. 143(3): Assessment – Assessment order without DIN (document identification number ) has not valid in law – Statutory defects in the assessment order cannot be cured by applying the provision of section 292B of the Act Circular No 19 of 2019 dated 14 -8 -209 ( 2019) 416 ITR 140 (St) –Circular of CBDT is binding on the Revenue – Order of Tribunal quashing the assessment order was affirmed . [ S. 144C, 147, 292B ]