SyncRepl fails object class 'organization' requires attribute 'o'

Hi,

I'm trying to set up SyncRepl between two servers. When the SyncRepl client connects and tries to start it logs:

| Entry (dc=example,dc=nl): object class 'organization' requires attribute 'o' | syncrepl_null_callback : error code 0x41 | syncrepl_entry: rid=000 be_add dc=example,dc=nl failed (65)

There is only one such entry in the db and it has an 'o' attribute:

| dn: dc=example,dc=nl | objectClass: top | objectClass: dcObject | objectClass: organization | dc: example | o: example.nl | structuralObjectClass: organization | [ .. create, modify, entry uuids etc ..]

What could i be missing here?

Regards, -Sander.