Use this window to enter, modify and view the reason codes for a message code of a payment format. The reason codes are used for the purpose of giving additional information about the payment transaction which is imported with the message code from the external file. The reason codes are generally connected to message codes for payment format and are usually predefined by a payment institute, or a payment organization. These are the default reason codes, which are copied to the external payment parameters when external payment parameters are created for a payment method which is linked to the payment format.