Alternative SecurityIDs for an instrument specified in the InstrumentScope.
| Tag | Name | Type | Required | Description |
|---|---|---|---|---|
| 1540 | NumInGroup | Number of alternate security identifier for the specified InstrumentScopeSecurityID (1538). | ||
| 1541 | String | Required when NoInstrumentScopeSecurityAltID > 0 | ||
| 1542 | String Enum | Required when NoInstrumentScopeSecurityAltID > 0 |