Remove/change replication partner

[Jean-Luc Chandezon]

Hello,
I'm trying to remove replication partner (olcSyncrepl overlay).

Here are results for partner parameter(config):

# ldapsearch -LLLY external -H ldapi:/// -b "olcDatabase={0}config,cn=config" 
olcSyncRepl

SASL/EXTERNAL authentication started
SASL username: gidNumber=0+uidNumber=0,cn=peercred,cn=external,cn=auth
SASL SSF: 0
dn: olcDatabase={0}config,cn=config
olcSyncrepl: {0}rid=01 provider=ldap://bea-olp-001.lan-explore.fr binddn="
cn=replication,dc= lan-explore,dc=fr" bindmethod=simple credentials=i2Df
0rXiQokb8HtYZemJ searchbase="cn=config" type=refreshAndPersist retry="5 5 300
  5" timeout=1
olcSyncrepl: {1}rid=02 provider=ldap://cdb-olp-001. lan-explore.fr binddn="
cn=replication,dc= lan-explore,dc=fr" bindmethod=simple credentials=i2Df
0rXiQokb8HtYZemJ searchbase="cn=config" type=refreshAndPersist retry="5 5 300
  5" timeout=1

dn: olcOverlay={0}syncprov,olcDatabase={0}config,cn=config

dn: olcOverlay={1}syncprov,olcDatabase={0}config,cn=config

dn: olcOverlay={2}syncprov,olcDatabase={0}config,cn=config


I tested this query:

dn: olcDatabase={0}config,cn=config
changetype: modify
delete: olcSyncrepl

The result is:

ldapmodify -Y EXTERNAL -H ldapi:/// -f removeConfigPartner.ldif
SASL/EXTERNAL authentication started
SASL username: gidNumber=0+uidNumber=0,cn=peercred,cn=external,cn=auth
SASL SSF: 0
modifying entry "olcDatabase={0}config,cn=config"
ldap_modify: Server is unwilling to perform (53)
        additional info: shadow context; no update referral

Please what I missed?

Thanks,

Jean-Luc