Write to ldap addressbook - Thunderbird 3.01 Alpha

Hi,

I've compile thunderbird version 3.0a1pre (2007121419) on linux ubuntu 
gutsy, I've added :
#define MOZ_EXPERIMENTAL_WRITEABLE_LDAP true
to file "nsAbLDAPDirectory.cpp, in order to see how things are going 
with ldap write.

I've added mozilla ldap schema to run with openldap. I can now edit 
address cards but when I click on "save" button it says :
LDAP : adding objectClass top
LDAP : adding objectClass person
LDAP : adding objectClass organizationalperson
LDAP : adding objectClass inetorgperson
LDAP : adding objectClass mozillaabpersonalpha
LDAP : setting attribute sn (LastName) to 'testLastName'
LDAP : setting attribute givenname (FirstName) to 'TestFirstName'
LDAP : setting attribute cn (DisplayName) to 'TestFirstName testLastName'
LDAP modification failed (code: 21, message: objectClass: value #4 
invalid per syntax)


Do you have any idea ?

Regards,

Pierre