Yes, this can be accomplished in the Registers screen.
- From the main menu, open Accounting > Registers.
- Select the Register from the drop-down that you want to undo the reconciliation for.
- From the more menu, click Reconcile.
- On the Reconcile Accounts dialog, click Manage Reconciliations.
- Core displays the account reconciliation history. Click Actions > Undo.
- Core notifies you of the effects of this action on your account. Click Confirm.