Type: String
Sub-type qualification/identification of the SecurityType. As an example for SecurityType (167)="REPO", the SecuritySubType="General Collateral" can be used to further specify the type of REPO.
If SecuritySubType is used, then SecurityType is required.
For SecurityType="MLEG" a name of the option or futures strategy name can be specified, such as "Calendar", "Vertical", "Butterfly".
For SecurityType (167)="OPT" the subclassification can be specified, such as "Asian".
For SecurityType (167)="SWAPTION" a value of "Straddle" is used to identify a straddle swaption.
Added in protocol FIX.4.4
See in: FIX.4.4, FIX.5.0, FIX.5.0SP1, FIX.5.0SP2.