MSA Segments
Contents
The MSA segment indicates what message is being acknowledged and whether it was successfully received and processed. There are two relevant types of information inside the MSA segment:
| Location | Information | Description |
|---|---|---|
| MSA.1 | Acknowledgment Code | Indicates whether or not the message was successfully received and processed (‘AA’ for a positive ACK; ‘AE’ or ‘AR’ for a negative ACK). |
| MSA.2 | Message Control ID | This represents the unique ID of the message that is being acknowledged. |
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