Problem with ldapmodify: Internal (implementation specific) error (80)

[openldap.lists@frei-family.ch]

haven't found a solution in Mailing list archive and fix-lists of  
2.3.35/2.3.36

Environment
===========
- OpenLDAP 2.3.34 on Solaris 8 with BDB 4.5.20.NC-p2
- current status (retrieved using ldapsearch -x -D  
"cn=manager,cn=config" -w password -H "ldap://hostname:port"; -b  
"cn=config"):

# {2}hdb, config
dn: olcDatabase={2}hdb,cn=config
objectClass: olcDatabaseConfig
objectClass: olcHdbConfig
olcDatabase: {2}hdb
olcSuffix: ou=log
olcAccess: {0}to * by dn.base="cn=manager,cn=config" write by * read
olcRootDN: cn=manager,ou=log
olcDbDirectory: /var/malbec/mdch/mdch-accesslog-data
olcDbConfig: {0}set_cachesize 0 1280000 0
olcDbConfig: {1}set_flags DB_LOG_AUTOREMOVE
olcDbConfig: {2}set_lg_dir /var/malbec/mdch/mdch-accesslog-logs
olcDbIndex: objectClass eq
olcDbIndex: reqStart eq
olcDbIndex: reqAuthzID eq


What I'm trying to do
=====================
I'm trying to apply an ldif file having the following content (only  
four lines):

dn: olcDatabase={2}hdb,cn=config
changetype: modify
add: olcDbCheckpoint
olcDbCheckpoint: 100000 30

with the following command:
ldapmodify -x -D "cn=manager,cn=config" -w password -H  
ldap://hostname:port -f configure_db_checkpointing.ldif


Problem, Symptoms
=================
- Desired entry is not being added
- In the console I get the following error message:

modifying entry "olcDatabase={2}hdb,cn=config"
ldap_modify: Internal (implementation specific) error (80)

- In the ldap.log I get the following related entries:
Jun 25 16:43:39 c004503 slapd[3058]: [ID 848112 local4.debug]  
conn=5515 fd=19 ACCEPT from IP=xyz:xyz (IP=0.0.0.0:port)
Jun 25 16:43:39 c004503 slapd[3058]: [ID 215403 local4.debug]  
conn=5515 op=0 BIND dn="cn=manager,cn=config" method=128
Jun 25 16:43:39 c004503 slapd[3058]: [ID 600343 local4.debug]  
conn=5515 op=0 BIND dn="cn=manager,cn=config" mech=SIMPLE ssf=0
Jun 25 16:43:39 c004503 slapd[3058]: [ID 588225 local4.debug]  
conn=5515 op=0 RESULT tag=97 err=0 text=
Jun 25 16:43:39 c004503 slapd[3058]: [ID 249368 local4.debug]  
conn=5515 op=1 MOD dn="olcDatabase={2}hdb,cn=config"
Jun 25 16:43:39 c004503 slapd[3058]: [ID 396994 local4.debug]  
conn=5515 op=1 MOD attr=olcDbCheckpoint
Jun 25 16:43:39 c004503 slapd[3058]: [ID 699942 local4.debug] No  
structuralObjectClass for entry (olcDatabase={2}hdb,cn=config)
Jun 25 16:43:39 c004503 slapd[3058]: [ID 588225 local4.debug]  
conn=5515 op=1 RESULT tag=103 err=80 text=
Jun 25 16:43:39 c004503 slapd[3058]: [ID 218904 local4.debug]  
conn=5515 op=2 UNBIND
Jun 25 16:43:39 c004503 slapd[3058]: [ID 952275 local4.debug]  
conn=5515 fd=19 closed


Questions
=========

- Has anyone come across this behaviour ?
- Any hints / suggestions / tips ?

Thanks

Christoph