System marks are on 3d relation but do not have MfgGeom3d.
System marks are on the 3d relation but do not have MfgGeom3d.
Coding or data model errors.
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.