ITC claimed under wrong head

A taxpayer incorrectly claimed CGST and SGST instead of IGST in FY 2018-19, with no corrections made until September 2019. While the net tax payable was settled correctly, the question arises whether this error can be rectified in the GSTR-9 return and if the IGST credit will be lost. The discussion suggests that GSTR-9 amendments don't alter the electronic credit ledger, potentially leading to the lapse of the IGST credit, though correct figures should still be reported.