The term "reconciliation" in QuickBooks refers to the comparison of two connected accounts. You can undo reconciliation in the software if the action has to be reversed. Due to inaccurate dates entered for transactions or a bad data sequence, it is possible to undo a reconciliation. We've shown How to Undo Bank Reconciliation in Quickbooks Online, QuickBooks Desktop, and other versions of the software to help you understand the process. Reversing reconciliations in QB can be done for a variety of reasons.