Unique identifier of Execution Report (8) message as assigned by broker (will be 0 (zero) for ExecTransType (20) =3 (Status)).
Uniqueness must be guaranteed within a single trading day or the life of a multi-day order. Firms which accept multi-day orders should consider embedding a date within the ExecID (17) field to assure uniqueness across days.
(Prior to FIX 4.1 this field was of type int)
Used in:
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