Hello, My question, I have a meta backend that work perfectly but on the dev team somebody ask me : Why on AD this organizationalUnit have these valuies on  attrs : managedBy: CN=Surname Name,OU=Users,DC=domain,DC=fr seeAlso:        CN=Sunrame2 Name2,OU=Users,DC=domain,DC=fr and on meta on the same OU : managedBy: cn=surname name,ou=Users,ou=meta,dc=domain,dc=fr seeAlso:        cn=Surname2 Name2,ou=Users,ou=META,dc=domain,dc=fr the AD is "bind" to ou=META,dc=domain,dc=fr  ( suffixemassage) all OU on meta have the same behavior so * why on managedBy attr all is modified in lowercase and only CN and OU on seeAlso ? * how work uppercase to lowercase with meta backend  ? is overlay rwm implicated ? my meta backend config is very long but somme informations moduleload      back_meta moduleload      rwm moduleload      valsort moduleload      memberof moduleload      dynlist moduleload      sssvlv.so moduleload      collect moduleload      pcache moduleload      back_monitor moduleload      back_ldap moduleload      back_mdb overlay                 rwm rwm-rewriteEngine on rwm-normalize-mapped-attrs yes ... lot of rewrite rules etc. version : @(#) $OpenLDAP: slapd 2.4.44 $     opensuse-buildservice(a)opensuse.org openSUSE Leap 42.2 thanks for your answers. Nicolas