SAP Message C$264 - Could not completely delete value assignment

Diagnosis
The deletion of a value assignment comprises two steps:
Deletion of the value assignment in EHS
Deletion of the value assignment in the Classification System
The system could not delete the value assignment in the ClassificationSystem.

System Response
The system only deleted the value assignment in EHS.

Procedure
To delete the value assignment completely, you must first undo thedeletion.
Choose Edit -> Undo. Now try to delete the value assignmentagain. If the error occurs again, contact your system administrator.

Caution
When you undo the deletion, all changes you made since you last savedyour entries are undone as well.