| Tag | Field Name | Data Type | Union Datatype | Description | Added | Depr. | Enums from tag |
|---|---|---|---|---|---|---|---|
| 459 | UnderlyingSecurityAltIDSource | String |
Identifies class or source of the UnderlyingSecurityAltID value. Required if UnderlyingSecurityAltID is specified. Valid values: Same valid values as the SecurityIDSource (22) field | Added FIX.4.3 |
|