Outward Bill entered twice in GSTR1 and Payment Paid -Solution.

hi

One of my client who uploaded outward supply twice in the month of November,2019 and paid taxes on the duplicate bill. He does not know the bills are entered twice until March 2020, now his march 2020 return is still pending. Now, how can he able to get the credit back to his account?

March liability is Rs.425000 and the tax payment on duplicate bill is Rs.375000/- can he able to adjust? Kindly let me know the procedures. 

Thank you..