| Tag | Field Name | XML Name | Data Type | Union Datatype | Description | Added | Depr. | Enums from tag |
|---|---|---|---|---|---|---|---|---|
| 606 | LegSecurityAltIDSource | @SecAltIDSrc | String |
Multileg instrument's individual security’s SecurityAltIDSource. See SecurityAltIDSource (456) field for description | Added FIX.4.3 |
|