modifying a transaction log message

The Book points out that changing a transaction is not a good idea as
it leaves the client out of sync. I can't see how changing the log
would be harmful though.

What I'd like the do is:

    svn commit -m bugid:4582

and then have a hook script ask a CRM program for headline text for
the given bug and add it to the transaction log.

Why might that be a problem?

How can I change the transaction log from a hook anyway? I saw
svnadmin setlog, but that works on a revision, not a transaction I
think.

Thanks,

-- 
> Nick Thompson
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