My current test System:
Zimbra Ldap Master (OSE)
Zimbra Ldap Replica (OSE)
Samba Server

Setup Guides:
Replica Server: Installing a Replica LDAP Server
Samba with Zimbra: UNIX and Windows Accounts in Zimbra LDAP and Zimbra Admin UI 6.0 - Zimbra :: Wiki

I have successfully set up the connection between Ldap Master, Replica and the Samba server.
But i have now a problem to set up new users with "smbpasswd -a user".

smbpasswd -a root
New SMB password:
Retype new SMB password:
Failed to modify entry for user root.
Failed to modify password entry for user root
I have searched and found out, that if i configure the samba server that it connects directly to the Zimbra Master Server the command works without problems.

Zimbra Master <-> Zimbra Replica <-> Samba -> "smbpasswd -a root" not working
Zimbra Master <-> Samba -> "smbpasswd -a root" working

So it seems for me that the Replica Server has no permissions to change something at the Master Server.

Is there a way to change this behavior?