SAP Message C$259 - Error &1 when loading characteristic value assignment

Diagnosis
An error occurred when loading the dialog.

System Response
The dialog display is not complete. You cannot assign values.

Procedure
Exit the dialog and try to assign values to a different valueassignment type. If the error occurs again, notify your systemadministrator.

Note for the system administrator:
The error may be caused by an incorrect entry in system table TCG11.