CiviCRM Community Forums (archive)

I am reposting this message from the core function forum and hope I can get some helps here!
http://forum.civicrm.org/index.php/topic,25948.0.html

I am building a site for a university which will need to use multi-level ACL. This is similar to the case in NZ Green Party,

    Staff at university Provost's office has access to all faculty or students contact records,
    College dean has access to all faculty or students contact records within its college,
    Department chair has access to all faculty or students records within its own department.

I am trying to follow the instruction on this page about multi-level organization ACL permission  at wiki.civicrm.org/confluence/display/CRMDOC41/Multi-level+Organization+ACL+Permissions, and the post about permission hooks at  wiki.civicrm.org/confluence/display/CRMDOC41/CiviCRM+hook+specification#CiviCRMhookspecification-Permissionrelatedhooks.

However, before I come to the point to create a hook, the system doesn't allow me to use the the same field names in different custom field groups. I can't use the same fields (college, department) for the region and permissions group of custom fields.  Therefore, I assume the codes from the hook_civicrm_aclWhereClause won't work...

Anybody has suggestion how to make this work?

Thanks.