@Alex315

I've got you covered, Dr. Abreu.

As Rustler mentioned above, even if the transaction is being disputed, once it's completed you don't want to alter it. Instead, just issue a Refund Receipt for the disputed amount. I'll guide you through doing this below:

Create a Refund Receipt

1. From QuickBooks Online, click the Plus (+) icon and select Refund Receipt.
2. Select the customer who is disputing the transaction at the top, and enter a Product/Service that you'll be refunding from (thus reducing the Income from the disputed invoice).
3. If ACH payments are enabled, be sure to pick the correct refund account and payment type before continuing.
4. Click Save and send.

This process is also covered in our tutorial on Refund Receipts here. Check out this video demonstration for a quick example:

With these instructions, you can refund as much as you need without having to edit the disputed transaction. Please let me know if there's anything else you need, I want to make sure you're taken care of. Thanks for reaching out, wishing you a wonderful rest of your day.