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

A client accidentally entered an outward supply bill twice in GSTR1 for November 2019, paying tax on the duplicate. They discovered this in March 2020 with their return pending. The recommended solution is to amend the duplicate bills to zero value in the current GSTR1. This will allow for the excess tax paid to be reversed in the March 2020 GSTR3B, effectively reducing the output tax liability and enabling the taxpayer to claim the credit.