Replica:can't insert entry from slave server

["richard mou" <mourichard@hotmail.com>]

I got problems:
This is a LAN, ldap master server "master", ldap replica slave server 
"slave".
The slapd.conf on master(192.168.12.132) is:
database        ldbm
suffix          "dc=mt,dc=com"
rootdn          "cn=beijing,dc=mt,dc=com"
rootpw          secret
access to * by dn.base="cn=Slave,dc=mt,dc=com" write
        by  dn.base="cn=beijing,dc=mt,dc=com" write
        by  dn.base="cn=shanghai,dc=mt,dc=com" write
       by * read
directory       /etc/openldap/ldap
replica host=192.168.12.134:389
        bindmethod=simple credentials=secret
        binddn="cn=Slave,dc=mt,dc=com"

The slapd.conf on slave(192.168.12.132) is:
database        ldbm
suffix          "dc=mt,dc=com"
rootdn          "cn=shanghai,dc=mt,dc=com"
rootpw          secret
access to * by dn.base="cn=Slave,dc=mt,dc=com" write
        by  dn.base="cn=beijing,dc=mt,dc=com" write
        by  dn.base="cn=shanghai,dc=mt,dc=com" write
        by * read
updatedn        "cn=Slave,dc=mt,dc=com"
updateref       192.168.12.132:389

I have added the users with objectClass "top" and "person": 
shanghai,beijing, slave

Now, the replica from master to slave is good, but the replica from slave 
to master is not running:
ldapadd -D "cn=shanghai,dc=mt,dc=com" -x -w secret -f person.ldif
adding new entry "cn=sh02,dc=mt,dc=com"
ldapadd: update failed: cn=sh02,dc=mt,dc=com
ldap_add: Referral (10)
        referrals:
                192.168.12.132:389

I got the same error when binding "cn=beijing,dc=mt, dc=com".
While, I can succeed when binding "cn=slave, dc=mt,dc=com", but the entry 
is only inserted into the slave server, not able to be inserted into the 
master.

What is wrong?
Anyone can help me?

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