svn:externals problem

I've just tried to set the following svn:externals property

    lib/lvk/program_analysis http://zigzag.cs.msu.su:7813/lvk/trunk/program_analysis

And on update, I get:

     Fetching external item into lib/lvk/program_analysis
     subversion/libsvn_wc/lock.c:309: (apr_err=155007)
     svn: Path is not a working copy directory
     svn: 'lib/lvk' is not a working copy

I attach the script which reproduces the problem. Note that it happens only
if I do update with uncommitted changes to svn:externals. If I commit and
do checkout, everything's OK. It's not so critical bug, but I don't think
it's in tracker, either. I probably can try fixing it, if I'm told how ;-)

- Volodya

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