You may find useful SAS DOC and supplemental technical papers at the SAS Support website
http://support.sas.com/ -- here is one topic related paper from a SAS conference to consider.
Scott Barry
SBBWorks, Inc.
Integrity Constraints and Audit Trails Working Together
Gary Franklin, SAS Institute Inc., Austin, TX
Art Jensen, SAS Institute Inc., Englewood, CO
http://www2.sas.com/proceedings/sugi25/25/aa/25p008.pdf