SelectionMgr.GetSelectedObjectType3() return undefined value

In the condition that a sensor is selected in Feature Manager Design Tree,

SelectionMgr.GetSelectedObjectType3() return 195 (195 is undefined in enum swSelectType_e).

The type of selected sensor is dimension.

Is this phenomeron a software defect?

What i want to do is to judge whether sensor is selected or not.

Besides, is not there the method good?

SolidWorks 2011 x64 Edition SP5.0

Windows 7  x64

SolidworksApi macros