| Tag | Field Name | Abbr Name | Data Type | Union Datatype | Description | Pedigree |
|---|---|---|---|---|---|---|
| 1973 | SideRegulatoryTradeIDSource | Src | String | Identifies the reporting entity that originated the value in SideRegulatoryTradeID(1972). The reporting entity identifier may be assigned by a regulator. | Added EP161 |
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