Parties vs Nested Parties

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Imported from previous forum

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Can someone tell me the difference between Parties and Nested Parties? When would I use one or the other. Specificaly, in the 4.3 release notes, I see the following bullet points and I am trying to figure out why in the Allocation ACK message ExecBroker would be in the Parties field yet in the Allocation message ExecBroker would be in the NestedParties field.

**Removed BrokerOfCredit, ClientID, and ExecBroker fields and replaced with component block in Allocation message.
**Removed ClientID and ExecBroker fields and replaced with component block in Allocation ACK message.

Thanks in advance.

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The Allocation message contains block-level details at the “overall” level plus a repeating group of account-level details (“splits”). is defined at the overall, block-level. is defined at the split, account-level. The distinction is important when there is a need to provide party-related information at more than one level within a given message and to avoid re-use of the same field (tag) in different contexts within a message instance.

Can someone tell me the difference between Parties and Nested Parties?
When would I use one or the other. Specificaly, in the 4.3 release
notes, I see the following bullet points and I am trying to figure out
why in the Allocation ACK message ExecBroker would be in the Parties
field yet in the Allocation message ExecBroker would be in the
NestedParties field.

**Removed BrokerOfCredit, ClientID, and ExecBroker fields and replaced
with component block in Allocation message. **Removed
ClientID and ExecBroker fields and replaced with component
block in Allocation ACK message.

Thanks in advance.