Sub-type qualification/identification of the SecurityType (167) (e.g. for SecurityType="REPO").

Example values:

General = General Collateral (for SecurityType (167)="REPO")

For SecurityType (167)="MLEG" markets can provide the name of the option or futures strategy, such as Calendar, Vertical, Butterfly, etc.

NOTE: Additional values may be used by mutual agreement of the counterparties