This segment is used to identify the interchange being acknowledged
| Position | Element | Name | Requirement | Type | Min/Max | Repeat |
|---|---|---|---|---|---|---|
10 | 20 | Interchange control reference | Mandatory | Alphanumeric | 1/1 | 1 |
40 | 83 | Action, coded | Mandatory | Alphanumeric | 1/3 | 1 |
50 | 85 | Syntax error, coded | Opt | Alphanumeric | 1/3 | 1 |
60 | 135 | Service segment tag, coded | Opt | Alphanumeric | 1/3 | 1 |
80 | 534 | Security reference number | Opt | Alphanumeric | 1/14 | 1 |
90 | 138 | Security segment position | Opt | Alphanumeric | 1/6 | 1 |
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