Hi pmc17
I think you have jumped the gun a bit and need to unwind a bit. Ideally, you want to use the below process which will apply the second payment which, in turn, will produce the credit.
Note the above process assumes you have already entered the first customer payment
- Navigate to Sales>>Create invoice payment
- Select the Customer
- Select Show closed invoices
- Enter payment information as normal
- Select Save
This will generate a customer debit which can be found in Sales>>Customer returns
- Navigate to Sales>>Customer returns
- Select Refund
- Ensure the information is correct
- Select Record
What the above process will do is generate two bank transactions (this is in addition to the one already created for the first payment). You will have a deposit to the bank account which can be matched to the second customer payment and a withdrawal which is the refund to the customer.