The sequence number is used to determine which event occurred first on a Trading Venue when two events have the same timestamp. Trading Venues should ensure that each of the specific events that are listed in Field 21 under the content and format columns should be assigned a sequence number. Trading phases listed in section 6.13.9 are captured by the event ‘change of status due to market operations’ listed in Field 21. Therefore Trading Venues should populate the sequence number for changes in trading phases.
Some Trading Venues may operate with multiple matching engines to balance load across their systems. In this case, the sequence number should be unique to each event and consistent across all events on that matching engine.
The following examples are provided:
1. Incorrect use where the sequence number is only specific to the single order book
2. Incorrect use where the sequence number appears to be unique per order
3. Correct use of the sequence number.
For Examples 77 an
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