Source: eDirectory or NDS
Explanation: An attempt was made to remove a schema class definition that is used in the expanded class definition of an object or that is specified in the containment list of another schema class definition.
Or, an attempt was made to remove a schema attribute definition specified in a naming, mandatory, or optional attribute list of a schema class definition.
Possible Cause: If this error occurs during schema synchronization, significant discrepancies can exist between the schema in the eDirectory or NDS databases on the servers.
Action: Handle this as a schema synchronization error.