This field will always be set to `false` for Start of a message bundle. true - When this is the last or only bundle for a transaction. false - When this is not the last or only bundle for a transaction.

Date-time of the message sent.

Start/End of a message bundle indicator.

The value used to associate bundles of the same transaction. This value will be `0` when the transaction has no trade. The value will be `-1` if the channel does not support sub-bundling.