Description
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".