This read-create INTEGER points to the specific ACL that a given ACE-reference row associates an ACE with. An admin builds up an ACL's rule set by creating rows in this reference table, each pointing back to the ACL via this field while another field points to the specific ACE being added. For example, to add a third rule to an existing ACL, the admin creates a new reference row with this pointer set to that ACL's index and the corresponding ACE pointer set to the new rule.