strange slrupd error

[Dieter Kluenter <dieter@dkluenter.de>]

Hi,
I have setup a replication server, master and slave are of
openldap-2.1.19. When a new entry to the addressbook occurs, the slave
sometimes refuses updating its database, though the new entries are
accepted by the master.

-.-.-.-.-.-.-.-.-.-.-
gruen slapd[19736]: conn=3 op=2 ADD dn="cn=xxxx,ou=adressbook,o=avci,c=de" 
gruen slapd[19736]: conn=3 op=2 RESULT tag=105 err=19 text=structuralObjectClass: no user modification allowed 
-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-

The entries are created using ldap-abook, so objectclasses and
attributes are allmost the same, and creatorsName is allways
admanager. Following a rejected entry:

-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-
ERROR: Constraint violation
replica: gruen.avci.ce:389
time: 1060701584.0
dn: cn=xxxxxx,ou=adressbuch,o=avci,c=de
changetype: add
cn: xxxxxx
sn: xxxxx
telephoneNumber: 123456789
facsimileTelephoneNumber: 98765432
o: some company
title: xxxxxxx
postalAddress:: xxxxxxxxxxxxxxx
fileAs: xxxxxxxxxxx
objectClass: top
objectClass: person
objectClass: organizationalPerson
objectClass: inetOrgPerson
objectClass: calEntry
structuralObjectClass: calEntry
entryUUID: 25a64006-6124-1027-821e-eba8495993af
creatorsName: cn=admanager,o=avci,c=de
createTimestamp: 20030812151944Z
entryCSN: 2003081215:19:44Z#0x0001#0#0000
modifiersName: cn=admanager,o=avci,c=de
modifyTimestamp: 20030812151944Z
-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-

calEntry is a structuralObjectclass within the person chain. As said,
only 2 out of 10, more or less identical entries, are rejected by the
slave. 
Any hints?

-Dieter

-- 
Dieter Kluenter  | Systemberatung
Tel:040.64861967 | Fax: 040.64891521
mailto: dkluenter(at)dkluenter.de
http://www.avci.de