SVN 1.7 SVNParentPath broken

[Mario Brandt]

I installed SVN/1.7.0-beta2 using it over apache 2.3.12, also tried
the alphas before. With none of it I'm able to use SVNParentPath. I'm
getting

<m:human-readable errcode="2">
Could not open the requested SVN filesystem
</m:human-readable>

the same error if that wouldn't be a repo instead of showing the list of repos.

my config
      <Location "/">
       DAV svn
       SVNParentPath "/opt/repos"
       SVNListParentPath on
       SVNPathAuthz on
       #SVNIndexXSLT "/svnindex.xsl"

       AuthType Basic
       AuthName "Subversion Repository"
       AuthUserFile /opt/repos/htpasswd
       Require valid-user
       </Location>


Cheers
Mario