Spatial Load object has no Parent object.
Spatial Load object is not connected to its parent object (Load Combination).
Coding or data model errors.
Modification is not possible.
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.