Held, that there was a clear violation of the specific requirement under the Central Board of Direct Taxes Circular No. 19 of 2019 ([2019 416 ITR (St.) 140) to quote the document identification number in the body of the assessment orders. Para 4 of the Circular which says in unequivocal terms that any communication which is not in conformity with paras 2 and 3 shall be treated as invalid and shall be deemed never to have been issued. Thus, the assessment orders passed by the Assessing Officer under section 143(3) of the Income-tax Act, 1961 read with section 153A of the Act and as a natural corollary, the orders of the Commissioner (Appeals) were non est.(AY.2013-14 to 2018-19)