dovecot - Jun 2015 - Fatal: -N parameter requires syncing with remote host

hi

I get with default (not declared) 
replication_dsync_parameters above errors, and for users 
that I'm trying to disable replication.
I'm trying to disable with: override_fields = 
mail_replica="" in userdb and just in case (ldap) also 
user_attrs = =mail_replica=""

my replication conf is pretty basic:

service replicator {
   process_min_avail = 1
   unix_listener replicator-doveadm {
     mode = 0660
   }
}

service aggregator {
   fifo_listener replication-notify-fifo {
     user = vmail
     group = Domain Users
     mode = 0660
   }
   unix_listener replication-notify {
     user = vmail
     group = Domain Users
   }
}

service doveadm {
   inet_listener {
     port = 12345
   }
}

doveadm_password = secret
#

I can tell simple test:

doveadm -v sync -f -u my at my.domain ssh vmail at server doveadm 
dsync-server -u me at my.domain

works. It's for a user that I don't want replication.

What am I missing here?
many thanks