Subversion working Copy on Substituted Drive

Hi,

i have observed a strange thing on a windows machine....

I have substituted a working copy with a drive in Windows (subst)...

lets say working copy on D:\wc\test-checkout now i done a subst X:
D:\wc\test-checkout...

If i try to do a checkin in the root of the X: drive X:\ i got messages
like (translated by me i had a german message...):

Sending X:/test.txt
Transfer data .svn: transfer successful, but other error follow:
svn: Error during forwarding the revision after the transfer (details
follow):
svn: in directory X:...
svn: ..name attribute missing in log-entry...

After that the working copy can't be used anymore svn cleanup does not
work neither with svn CLI nor with TortoiseSVN....

Next test i did was to substitute the drive X: not directly with the
working copy root using a level higher..

subst X: D:\wc
now gone on X:
X:\test-checkout:

and now the commit is working ...without any problem..

I have done some research and found an very old entry about a crash in
SVN 1.4 (http://svn.haxx.se/users/archive-2006-10/1224.html)...

The question is: Can someone give me more detailed information about that ?
I just want to know why it's that way...

Many thanks in advance...

Kind regards
Karl Heinz Marbaise

-- 
SoftwareEntwicklung Beratung Schulung    Tel.: +49 (0) 2405 / 415 893
Dipl.Ing.(FH) Karl Heinz Marbaise        ICQ#: 135949029
Hauptstrasse 177                         USt.IdNr: DE191347579
52146 Würselen                           http://www.soebes.de