Type: String

Optional market assigned sub identifier for a trading session. Usage is determined by market or counterparties.
Used by US based futures markets to identify exchange specific execution time bracket codes as required by US market regulations.

Added in protocol FIX.4.3

See in: FIX.4.3, FIX.5.0, FIX.5.0SP1, FIX.5.0SP2, FIX.5.0SP2 EP240.