Undoing a bank reconciliation in QuickBooks Online depends on user permissions and the reconciliation status; standard users must manually unreconcile individual transactions by editing them and removing the reconciliation mark, while users with accountant access can use the “Undo” option in the reconciliation history to reverse an entire period at once. This process is important when errors are found in previously reconciled accounts, as it allows corrections without compromising financial accuracy, but it should be done carefully to avoid disrupting reporting and balances.

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