Virtual host with PROPFIND 301 problem only on top level repos

Guys, I spent the whole day searching infos for my problem on the web
and could not resolve my issue. My last hope is you :) Maybe you can help.

It sounds pretty easy:
A working svn setup under https://svn.example.com, virtual ssl host with
apache2.

Several repositories are hosted under /www/rcs/svn, e.g. 'it'

Now: Working on all top-level repositories will fail with the well known
error:

   svn: PROPFIND request failed on '/it'
   svn: PROPFIND of '/it': 301 Moved Permanently (https://svn.example.com)

BUT: Working *within* a subdirectory like 'it/something' would work.

Here is the relevant part of the configuration:

<VirtualHost MY-IP-HERE:443>
ServerName svn.example.com
DocumentRoot /srv/rcs/svn

<Location />
     DAV svn
     SVNParentPath /srv/rcs/svn
     AuthzSVNAccessFile /etc/apache2/svn_auth.conf
     AuthType Basic
     AuthName "Subversion Repository"
     AuthUserFile /etc/svn.passwd
     Require valid-user
</Location>

</VirtualHost>

Of course I tried various combinations of other settings for
DocumentRoot, SNVParentPath etc. But all I achieved is worse than now,
where people can at least work on the subdirectories of their repositories.

Any help is greatly appreciated. Let me know if you need more infos ...
Thanks,

-- 
Stephan A. Rickauer
----------------------------
Institut für Neuroinformatik
IT-Koordinator
Universität / ETH Zürich
Winterthurerstr. 190
CH-8057 Zürich
Tel: +41 44 635 30 50
Sek: +41 44 635 30 52
Fax: +41 44 635 30 53
http://www.ini.unizh.ch
stephan@ini.phys.ethz.ch
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