05 November 2020
You means it was no pertaining to RCM ITC? if yes. then in the next month 3B, you can reverse the wrong one and take it in the correct place.
05 November 2020
You have to show it in other reversal row. Let the credit appear in that column. Another thing you can do is when you have RCM credit in next periods then you shown less credit(by this wrong amount shown now) in RCM ITC row.