As per CBIC Press Release No. 62/2018, dated 18-10-2018
It is clarified that the furnishing of outward details in FORM GSTR-1 by the corresponding supplier(s) and the facility to view the same in FORM GSTR-2A by the recipient is in the nature of taxpayer facilitation and does not impact the ability of the taxpayer to avail ITC on self-assessment basis in consonance with the provisions of section 16 of the Act.
The apprehension that ITC can be availed only on the basis of reconciliation between FORM GSTR-2A and FORM GSTR-3B conducted before the due date for filing of return in FORM GSTR-3B for the month of September, 2018 ,further extended to 31 March 2019.
As per Section 155 of CGST Act, 2017 the burden of proof is cast upon the person who claims ITC.
As per Section 43 A (6) of CGST ACT both are jointly and severally liable to pay or to pay ITC.
The supplier is also statutorily bound to file returns under Section 39 wherein he is to mention details of all invoices.