Thank you for reaching out to the QuickBooks Community and sharing your concerns, Nagakambing. I can see that you've encountered issues creating a credit memo from an overpayment. No worries, I'm here to help you resolve this.

When you have an overpayment from a customer in QuickBooks Desktop (QBDT), there’s no need to create a Credit Memo to issue a refund. QuickBooks will automatically recognize the overpayment in your system, making the process seamless and efficient.

For the overpayment invoice, you need to locate the customer under the Customers section. You'll notice that there will be a negative amount under the Balance Total column.

After that, click the customer and find the payment transaction that was made that day, then double-click the transaction. On the receive payment screen, you'll be given two options, either you'll leave the credit to be used later or you can refund the amount to the customer, then click Save and Close.

I've added a couple of screenshots for your visual reference.

Additionally, if the transactions haven't been settled yet, you can void the payment anytime you want.

Comment on the post if you still have concerns about overpayments in QBDT. I'm here to help in any way I can.