Sub-type qualification/identification of the SecurityType <167> (e.g. for SecurityType="REPO"), or the CFICode <461> if SecurityType is not specified. If specified, SecuirtyType or CFICode is required.
General = General Collateral (for SecurityType="REPO")
For SecurityType="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