How do I deal with error message stating transaction has already been accepted?

Hello there. Let's get you out of this situation so you can continue itemizing your bank transactions inside QuickBooks Online (QBO).

It could be that these bank transactions you've mentioned are in the Categorize or Exclude section inside your Banking tab. With that said, you'll want to check those sections on your banking page. If the transactions show there, you'll want to click the Undo below the Action column to get them back into your For Review section.

Also, to ensure this has nothing to do with your browser, you'll want to access your company in an incognito or private browser. You can use these shortcut keys:

• Chrome: Ctrl+Shift+N
• Firefox: Ctrl+Shift+P
• Safari: Command+Shift+N

Once everything is ready, proceed to check your bank transactions in the Categorize and Exclude section.

In addition, you can refer to this article to learn more about handling your transactions inside QBO: Categorize and match online bank transactions in QuickBooks Online.

Aside from that, I've also got you this handy article about reconciling an account: Reconcile an account in QuickBooks Online.

Please let me know how it goes or if you need further assistance managing bank transactions inside QuickBooks. I've got you covered, and I'll help you out again. Stay safe!