Merge and reverse merge dont seem to cancel out

If I do
svn merge -r12:13 repository/branch
A f1
A f2
A f3

I get the addition of 3 files - exactly what I expected in the
circumstances.

but if I now do

svn merge -r13:12 repository/branch
I get
Skipped 'f1'
Skipped 'f2'
Skipped 'f3'

(And the files are not removed in the working copy.)
It seems that the unmerge does not manage to undo a merge. What else do you
have to do to ensure that this happens ?

Can anyone say what I am doing wrong?

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