Payment has not been made but reflected on the invoice is already PAID IN FULL

[Tut]

From an earlier post of a user with the same problem:

Invoices still says paid in full

Under the Sales Invoice tab, choose any invoice and, under the “Balance due” column click on the blue number. (For an invoice Manager believes is paid in full, that number should be zero.) You should see a list of at least two transactions. One should be described as “Sales Invoice” and should list the invoice number. The amount should show in black. The other (if the invoice was paid via a single transaction) should be the offsetting payment in red, a negative number. It would typically be desc…