System marks do not have relation to MfgGeom3d or MfgGeom2d.
System marks do not have a relation to MfgGeom3d or MfgGeom2d.
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.