SecuritySubType support in Security List Request / Security List

Imported from previous forum

[ original email was from Jim Northey - jnorthey@lasalletech.com ]
Add support for SecuritySubType queries using the Security List Request / Security List messages.

[ original email was from Kevin Houstoun - kevin.houstoun@ssmb.com ]
This has been assigned ID [PC20030319_8] and will be discussed by the technical committee.

> Add support for SecuritySubType queries using the Security List Request / Security List messages.
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