| Repeating Group 539 | NoNestedPartyIDs | | | Repeating group below should contain unique combinations of NestedPartyID, NestedPartyIDSource, and NestedPartyRole | Added FIX.4.3
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| 524 | NestedPartyID | ID | | Used to identify source of NestedPartyID. Required if NestedPartyIDSource is specified. Required if NoNestedPartyIDs > 0. | Added FIX.4.3
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| 525 | NestedPartyIDSource | Src | | Used to identify class source of NestedPartyID value (e.g. BIC). Required if NestedPartyID is specified. Required if NoNestedPartyIDs > 0. | Added FIX.4.3
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| 538 | NestedPartyRole | R | | Identifies the type of NestedPartyID (e.g. Executing Broker). Required if NoNestedPartyIDs > 0. | Added FIX.4.3
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| 2384 | NestedPartyRoleQualifier | Qual | | | Added EP179
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| Component(-) | NstdPtysSubGrp | Sub | | Repeating group of NestedParty sub-identifiers. | Added FIX.4.4
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