The Affected SOP Class UID of the C-FIND DIMSE request shall always be the UPS SOP Class negotiated for the Presentation Context under which the service is requested. This will always be either the UPS Pull SOP Class or the UPS Watch SOP Class. See CC.3.1 for further details.

For both the UPS Pull SOP Class and the UPS Watch SOP Class, the C-FIND is performed against the Unified Procedure Step Information Model shown in CC.2.8-1.