void or offset duplicate journal entry

Hello there, nanc. Let me assist you on how to void duplicate journal entries in QuickBooks Online (QBO).

Journal Entry (JE) can be vital in managing your business transaction accurately. However, duplicate journal entries may lead to errors since JE is part of the bank reconciliation process. You can follow the steps below on how to delete duplicate journal entries:

1. Go to the Reports tab on the MENU page.
2. Search for the Transaction List by Date report on the dropdown.
3. Click on Switch to classic view.
4. Filter out the Report period to All Dates, then click Run report.
5. Select the duplicate JE on the TRANSACTION TYPE column.
6. Click on the More option, which is located on the bottom part of your screen.
7. Select Delete.

Also, you can refer to this article if you want to void a transaction in another period without deleting it in QBO: Void a transaction from another period in QuickBooks Online.

Furthermore, you can check out this article to learn how to reconcile accounts so they match your bank and credit card statements in QBO: Reconcile an account in QuickBooks Online.

Feel free to click Reply if you have other concerns regarding JE or any QuickBooks-related concerns. We're here to lend a hand. Keep safe.

@nanc1 

You should only delete it if the JE is in the current period.  If you have closed out the period, then reverse it with an offsetting JE.