eDirectory fails to modify schema but does not throw error message.

Unable to add X-NDS_NOT_CONTAINER to User class via LDAP

When attempting to add the X-NDS_NOT_CONTAINER flag to a class in schema the server returned a success but did not modify the schema.  The client proceeded believing the change was made when it was not.

This is a known issue with eDirectory.  It is not possible to add this flag (effectively making a class a non-container) to an existing class within eDirectory.