updateref doesn't work

Hi,
I configured a slave ldap server and a master ldap server, But the 'updateref' doesn't work,
When I insert/update/delete the data in slave ldap server, The change will go directly to slave
and never go to master server, Did anybody know what's happen and how to solve this issue?

the slapd.conf in master is(under mandrake10 ,openldap 2.2.13):

database bdb
suffix "dc=example, dc=com"
rootdn "cn=Manager, dc=example, dc=com"

rootpw secret
directory /usr/local/var/openldap-data
replogfile /usr/local/var/openldap-slurp/replog
replica uri=ldap://192.168.0.12:12000
binddn="cn=Manager, dc=example, dc=com"
bindmethod=simple credentials=secret


the sldap.conf in slave is(under windows2000,Openldap 2.1.16):

database bdb
suffix "dc=example, dc=com"
rootdn "cn=Manager, dc=example, dc=com"
updatedn "cn=Manager,dc=example,dc=com"
updateref uri=ldap://192.168.0.13:9010
rootpw secret

Best Regards
Gother