When using the Cognos 8.2 SDK it is important to note that the value keyTransformation of Enumeration Set validateSeverityEnum only partially works.
If you set enumeration set validateSeverityEnum to keyTransformation, you will get back all errors, warnings, and information messages, but you may get little or no information back regarding the transformation steps from the report specification to the native query sent to the data source.
While the documented description for the keyTransformation information is correct, the feature is only partially implemented at present and may not return data. This is currently a known issue by Cognos and documented in the Cognos 8.2 Read Me Guide.