If you use QuickBooks Accounting software and you face your bank transaction, then there is a special tool for reconciliation. So if any of the clients require <a href=https://errorgenie.com/quickbooks/how-to-undo-a-reconciliation-in-quickbooks/>how to undo reconciliation in QuickBooks online</a> transactions then you can undo reconciliation by the software or manually for more information check out How to undo reconciliation in QuickBooks online.