Subversion update "bug" ?

svn 1.6.5 while in a working copy I modified a file for testing.
After testing I wanted to update the file I modified in the working copy to
the version in the repository.

the resulting update did not replace the files in the working copy as
expected the modified file still remains.

the only way I could have the update work was to delete the modified file
then do the update.

Why did svn not update the modified file ?

Phil

-- 
" The fundamental principle here is that the justification for a physical
concept lies exclusively in its clear and unambiguous relation to the facts
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