Config AuthzSVNReposRelativeAccessFile on SubversionEdge

Question

I would like to config access rule per repo on SubversionEdge.

I mean use AuthzSVNReposRelativeAccessFile = authz directive in httpd.conf to set up access file per repo instead of using one file for all repos.

<Location /svn/>   
   DAV svn
   SVNParentPath "/opt/csvn/data/repositories"
   SVNReposName "CollabNet Subversion Repository"

  <IfModule deflate_module>
    SetOutputFilter DEFLATE
  </IfModule>
  AuthzSVNReposRelativeAccessFile "authz"
  SVNListParentPath On
</Location>

But it doesn't work, access rule still using one file for all. Any folks here have exp on configuring like this, please help. Thanks.