delete a user schema from cn=config

[Derek Zhou <derek@shannon-data.com>]

Hi list,

I was experimenting locally written schema with a recent build of slapd. I 
added the schema ldif with no problem using 

ldapadd -QY EXTERNAL -H ldapi:///  ...

But then I realized I made a mistake, so I try to delete it with 

ldapdelete  -QY EXTERNAL -H ldapi:/// 

it says:

ldap_delete: Server is unwilling to perform (53)

what does it mean? The schema is not used by any data on the server. I can use 
slapmodify to remove it after server shutdown, but that kind of suck and not 
much different, or even worse than editing conf file?

Derek