| Tag | Field Name | XML Name | Data Type | Union Datatype | Description | Added | Depr. | Enums from tag |
|---|---|---|---|---|---|---|---|---|
| 456 | SecurityAltIDSource | @AltIDSrc | String |
Identifies class or source of the SecurityAltID (455) value. Required if SecurityAltID is specified. Valid values: Same valid values as the SecurityIDSource (22) field | Added FIX.4.3 |
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