OpenLDAP and Solaris 10 - group problem

["Kick, Claus" <claus.kick@siemens.com>]

Hello everyone,
 
we are trying to use OpenLDAP to provide user management for a CMS. The
CMS relies on OS groups to manage directory branch- and file-access.
 
We are using the following group structure:
 
dn: cn=ts_de_de_gg_ax, ou=Group, o=**********
gidNumber: 1400
memberUid: uid=tsmaster, ou=People, o=**********
memberUid: uid=teamsite, ou=People, o=**********
memberUid: uid=ostehov9, ou=People, o=**********
memberUid: uid=zenksid3, ou=People, o=**********
memberUid: uid=lellirdg, ou=People, o=**********
memberUid: uid=osteholdap, ou=People, o=**********
objectClass: posixGroup
objectClass: top
cn: ts_de_de_gg_ax
 
a user looks like this:
 
dn: uid=osteholdap, ou=People, o=*********
sn: osteholdap
userPassword:: *********
loginShell: /bin/bash
uidNumber: 3618
gidNumber: 504
mail: ******
objectClass: top
objectClass: person
objectClass: posixAccount
objectClass: shadowAccount
objectClass: teamsiteinfo
objectClass: inetOrgPerson
uid: osteholdap
tcgid: Z000E58C
gecos: ***********
teamsiteuserrole: tsuser
shadowLastChange: 11111
cn: *******
homeDirectory: /tmp

However, it is not possible for a user to access directories belonging
to a secondary group he belongs to. What could be the issue here?
 
I would be very grateful for a pointer into the right direction.
 
Regards,
Claus Kick