group not shown from openldap - VCSA

Hi

I have upgraded vCenter from version 5.0 to 5.1 and configured LDAP source for SSO. So now I can add all ldap users and add the permissions.  For this purpose is used the schema inetOrgPerson. But I have troubles with the group and I have any clue whats is wrong ..

Any of groups not shown in vCenter. I see only users.

The group schema:

objectClass posixGroup (structural)

objectClass top (abstract)

cn

gidNumber

I have a two question:

1) What kind of attributes VCSA needs  ... ? Which schema ?

2) Is there a way to force vCenter use (for example common name ? )

Thanks you