Connecting Entity Generated Field

The majority of the audit trail columns have a corresponding FIX tag value with the exception of one field: Order Flow ID (position 8). This field exists only in the audit trail and is required to be generated by the connecting entity; the field will not be populated by CME Group

Order Flow ID

The order flow ID will tie all related messaging to an order. The value must remain the same throughout the life of the order, including modify and cancel requests. The connecting entity must capture the same ID value throughout the life of the order, starting with the new order and ending once the order has been filled or canceled/expired. Once a value has been used for the order flow ID, it may not be reused for the trading date and iLink session.