REMITTANCE TRANSACTION RESEARCH (RTR) SYSTEMThe (RTR) system lets the Tax Examiner immediately view images of checks and vouchers processed by the Integrated Submission and Remittance Processing (ISRP) system and Lockbox Bank Sites.Entering the (DLN) brings up the image without the need to enter any other research fields. See arrows above. Some electronic payments cannot be reviewed on RTR. If the DLN does not work, try the Trace ID.Note: Enter the DLN without dashes.