Cannot commit changes after merging from unrelated part of tree

Hello,

I have merged a subtree /software/abc into my tree /project/xyz. Both
trees contained no common files and have no combined history and
/project/xyz was created before /software/abc.

When i now try to commit a change made in /project/xyz to a file that is
merged from /software/abc, i got the following errors in the apache log:

Could not CHECKOUT resource /repo/!svn/ver/2734/projects/xyz/myfile.php.
  [409, #0]
resource out of date; try updating [409, #160024]

I tried updating, it does not change anything. In /project/xyz i can
view the complete log/history of the file from /software/abc incl a
compied from /software/abc at rev XY entry.

Updating the file in /software/abc works without any problems. Adding
files to /project/xyz works also, including adding files to subfolders
copied from /software/abc. Commiting changes to files in /software/abc
that where not merged in there also works.

Do anybody has a suggestion?

Thanks you for your help,

Dennis

-- 
Dennis Birkholz
Mobil: +49(0)177 717 95 42
dennis.birkholz_at_nexxes.net
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