CompartBoolOperator has no Compart Geometry or Geometry.
Compart Boolean Operator does not have Compart Geometry. The Compart Geometry holds the graphic representation of the Compartment object. It forwards all the display-related query interfaces to the graphic representation.
Coding or data model propagation errors.
This object is not visible in the graphic view. Modification of the resultant Compartment is not possible.
What You Should Do
You can select the resultant volume in the Workspace Explorer, and then delete the volume. Or, you can run the Clean Database custom command (ProgID SP3DCleanDatabaseCmd.CCheckObj). This command displays a dialog box that lists the objects in error. From the list you can select the objects and delete them.