What action should you take for a journal you posted that needs to be undone?

Reversing the journal is the appropriate action to take when you need to undo a posted journal entry. This method creates an opposite journal entry that effectively cancels out the effects of the original entry, maintaining accurate accounting records. You would utilize the reverse function to ensure that your books reflect the correct balances without losing the historical data of the original transaction.

Editing the journal would not be suitable as it might compromise the integrity of the transaction audit trail. Archiving the journal would not effectively remove its impact on financial statements, and it simply moves the journal to a different category without altering any financial data. Deleting the journal may remove it from view, but this could lead to complications in tracking financial records and regulatory compliance, as it does not maintain the historical context of the transactions. Therefore, reversing the journal is the correct and best practice for adjusting financial records.