If you've missed entering a B2B bill in your GSTR-1 return for a previous month, you can include it in your current month's return (e.g., April 2022). Ensure you use the original invoice date and number. If you don't have enough Input Tax Credit (ITC) to cover the tax liability from the missed bill for the original period, you may need to show it as a current month's sale in GSTR-3B and pay interest at 18% per annum.
10 May 2022
As it is a B2B bill enter the bill with the original date and invoice number in April 2022 return. However, if you do not have sufficient ITC to set off the output tax liability as at the end of the March, then in GSTR 3B show it as April Sale and pay interest @ 18% p.a. and show it clearly in the tax breakup wise liability in GSTR 3B.