Marking line active entity without detailed part as input.
Marking line active entity does not have a detailed part as input.
The related business object display does not correspond to its real geometrical state.
What You Should Do
To delete the object, 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.