openLDAP provider static groups setting when using posixgroup

Hi,

For openLDAP provider, when set the Provider Specific

In Static Groups section, what should I put if we use posixGroup instead of groupofNames?

Here is what I have tried and it did not work

Static Group Name Attribute: cn

Static Group Object Class: posixgroup

Static Member DN Attribute: memberuid

Static Group DNs from Member DN Filter: (&(memberuid=%M)(objectclass=posixgroup))

My LDAP administrator said he saw this in log (&(memberUid=uid=ysun3,ou=People,dc=uvm,dc=edu)(objectClass=posixGroup)). It seems %M is the problem. So what should it be %?

thanks

yan