One Tax invoice date (01.01.2020) for the month January, 2020 was wrongly submitted as 01.01.2019 in GSTR-1.As a result, that tax invoice had fallen under Financial Year 2018-19 instead of Financial Year 2019-2020. We had tried to amend in Table 9 of GSTR-1 but option for amendment for Financial Year 2018-19 is blocked as a result the client couldn't get any ITC in Financial Year 2019-20 regarding that Invoice.
Any other solution regarding the above problem?