I already "Received Payment" on an invoice, but I need to edit the payment date and payment method. warning box: other transactions linked to this one pops up. How to do?

Thanks for reaching out to us here in the Community, organizedbyginge.

The warning message occurs when you edit a transaction that's linked to others. The system is referring to the invoice transaction where the payment is connected to. You can hit Yes to save the changes.

You can always visit this article: Sales and customers. This will provide you links on how to manage your company income as well as resources about other customer-related concerns.

I'm only a post away if I can be of additional assistance with QuickBooks. I'm always here to keep helping. Wishing you a wonderful rest of the week.