| Tag | Field Name | XML Name | Data Type | Union Datatype | Description | Added | Depr. | Enums from tag |
|---|---|---|---|---|---|---|---|---|
| 817 | AltMDSourceID | @AltMDSrcID | String |
Session layer source for market data (For the standard FIX session layer, this would be the TargetCompID (56) where market data can be obtained). | Added FIX.4.4 |
|