How to disable schemacheck for ldap at ubuntu 7.04?

[amfpg]

i want disable schemacheck for openldap2.3-2.3.30 in Ubuntu 7.04

i have add this line in my slapd.conf

schemacheck off


then run

slapd -d 256

but i can see the schemacheck has been disable,

how to use this option at ubuntu 7.04?

thanks very much