In the Edit Payment window, if the Amount entered is greater than the Amount Owed, Studiometry accepts the amount without comment, applies the appropriate amount against the amount owed, and correctly remembers the overpayment amount but gives no indication that it is holding something in reserve. It will apply the reserve against a new invoice for that client.
Please provide a notification alert in the Edit Payment window when the Amount entered does not match the amount owed so the user is aware of a potential data entry error.