| Tag | Field Name | Abbr Name | Data Type | Union Datatype | Description | Pedigree |
|---|---|---|---|---|---|---|
| 523 | PartySubID | ID | String | Sub-identifier (e.g. Clearing Account for PartyRole (452)=Clearing Firm, Locate ID # for PartyRole=Locate/Lending Firm, etc). Not required when using PartyID (448), PartyIDSource (447), and PartyRole. | Added FIX.4.3 |
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