svn: File not found problem

We've come across a problem here: I hope someone can help us out:

Developer A has r 30 of a code base on his box.
Developer A then modifies some files in his working copy

Developer B deletes those files from subversion: svn remove foo.c

Developer A then tries to commit his changes:
svn status shows the file as modified (M)
svn commit fails, reporting file not found.

We've tried:
svn update -r30 // last version with the file in
svn commit

&
svn update
svn commit

Both of which fail with the same error.

Is there a way of getting this modified file back into subversion
without having to blow away its history and add it again?

-- 
Giles
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