Unhelpful error message in Subversion

While developing some scripts using the Subversion API, I encountered a
not-very-obvious error message.

Then I tried it from the command line, and found it was exactly the same.

The circumstance is
- I have a sandbox which is checked out from a branch
- I issue 'svn update -r 1700', where revision 1700 happens to be before
this branch was copied.
- SVN replies "REPORT of '/svn/sources/!svn/vcc/default': 200 OK
(http://svn.pace.internal)" which I take to be a WEBDAV status message.

This is easily reproducible, and in my eyes is a bug. I've had a look in
the bugzilla, but I'm not sure what to search for. I've had a google for
it, but the cases being discussed are either not this particular one, or
the people in question hadn't noticed that they were.

svn, version 1.5.4 (r33841)
    compiled Oct 27 2008, 05:40:26

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       *Colin Fine*
       *****Engineering Tools Group
       Pace plc*
       */Bringing Technology Home/*
       *Tel:    +44 1274 538038*
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