Thanks for seeking clarification about handling unallocated payments in QuickBooks Online, Diego. I'm here to provide some insight and answer your follow-up questions.

Please note that even if the payment date is set to 2025, your financial reports for last year will be affected because the date of the original transactions is 2024.

Given the potential effects these changes may have on your financial reporting, we strongly recommend consulting with your accountant. They can offer tailored guidance to ensure proper handling of these transactions.

Let me also share these steps on how to remove the attachment between the invoice and unapplied payments:

1. Open the invoice.
2. Scroll down to the Invoice total section and click the Payment on link.
3. Go to the Outstanding transactions section, then uncheck the invoice in the Receive Payment window.
4. Click Save and close.

You can also follow these steps if you're referring to unmatching online banking transactions:

1. Go to the Bank transactions section.
2. Proceed to the Categorized tab.
3. Look for the transaction that you want to unmatch.
4. Click Undo.

Here's an article about this process for more details: Unmatch downloaded bank transactions or move them to another account.

Let me also share these articles for additional reference materials when working with your bank transactions in QBO:

•  Exclude a bank transaction you downloaded into QuickBooks Online
• Undo transactions from reconciliations in QuickBooks Online

Don't hesitate to reach out again for further help with the Online Banking functions or financial data management within QuickBooks Online. We're here to assist you whenever you need it.