Can a months reconciliation be deleted and redone, when a mistake is discovered?

Hello there, john150,

To undo a reconciliation, you want to manually unreconcile each transaction.

Here's how:

1. Click the Gear icon, then select Chart of Accounts.
2. Find the appropriate bank, then click View register.
3. Select the transaction to edit.
4. Under Check column, click the box repeatedly to change the status. ("C" - Cleared, "R" - Reconciled, and "Blank" - Not cleared or reconciled)
5. Click Save.

Here's an article for reference: How to Unreconcile a Transaction or Undo a Reconciliation.

You might also want to read this article to learn more about reconciliation: Reconcile Your Accounts.

Let me know if you need anything else.