Identification of the message.
| Position | Element | Name | Type | Min/Max | Repeat | |
|---|---|---|---|---|---|---|
| C709-10 | 1475 | Message type identifier | Mandatory | Alphanumeric | 1/6 | 1 |
| C709-20 | 1056 | Version | Mandatory | Alphanumeric | 1/9 | 1 |
| C709-30 | 1058 | Release | Mandatory | Alphanumeric | 1/9 | 1 |
| C709-40 | 1476 | Control agency | Mandatory | Alphanumeric | 1/2 | 1 |
| C709-50 | 1523 | Association assigned identification | Opt | Alphanumeric | 1/6 | 1 |
| C709-60 | 1060 | Revision number | Opt | Alphanumeric | 1/6 | 1 |
| C709-70 | 1373 | Document/message status, coded | Opt | ID | 1/3 | 1 |
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