prasad Nilugal 22 July 2021
Imthias ahamed Kormath 22 July 2021
CA Altamush Zafar (GST Consultant) 22 July 2021
GSTR-9 cannot be rectified. But to mitigate the damage you can file GSTR-9C wherein correct explanation is given.
Or else you can wait till any inquiry is made by the department and then you can clarify your mistake.