LDAP query for recursive membership of groups not working in ARS?

Hello,

I have the need to use an LDAP recursive query in ARS such as:

(&(objectCategory=user)(memberOf:1.2.840.113556.1.4.1941:=CN=MyGroup,OU=MyOU,DC=mylab,DC=mydomain,DC=com))

I need to use this for a dynamic group membership. The reason is that I need the group populated by User objects and not Group objects.

The group I'm querying may have 2,3, or even 4 levels of nested groups, and I can't seem to be able to get just the list of User objects in ARS, nor this query works, it always returns the error: Error when getting next 25 records. Administration Service Encountered an error when searching the container object 'DC=mylab,DC=mydomain,DC=com'.

Anyone knows if this is a limitation of ARS 6.7.0.3623 ? Or another way to accomplish this?

Thanks,

Augusto.