| Tag | Field Name | Data Type | Union Datatype | Description | Added | Depr. | Enums from tag |
|---|---|---|---|---|---|---|---|
| 456 | SecurityAltIDSource | String |
Identifies class or source of the SecurityAltID value. Required if SecurityAltID is specified. Valid values: Same valid values as the SecurityIDSource field | Added FIX.4.3 |
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