Processing Acknowledgment Messages
The acknowledgment is sent by the MT service to Logical Terminal to confirm the receipt of a message and its safe storage by the service.
If an ACK is returned, the message is accepted by the MT service for delivery to its destination. If a NAK is returned, the message is safely stored, but failed to delivery. The structure of an ACK or a NAK message is the same, except that the value of tag 451 in the text block of an Acknowledgment message. 0 indicates the ACK, and 1 indicates the NAK.
MT acknowledgment messages are parsed using the FIN_Acknowledgment schema. This schema loads automatically after you create a Load SWIFT MT schema shared resource. The plug-in supports the parsing and rendering of the ACK and NAK message.