Also, if you file a new bug report, don't forget to usertag it! The following is an example bug report. There are many more templates available for you to make use from!
Subject: $package: fails to upgrade from 'testing' - trying to overwrite ...
during a test with piuparts I noticed your package fails to upgrade from
'testing'. It installed fine in 'testing', then the upgrade to 'sid'
fails because it tries to overwrite other packages files without
declaring a replaces relation.
See policy 7.6 at
From the attached log (scroll to the bottom...):
Please take care when filing bugs to file meaningful bugs and to not annoy maintainers. Don't nitpick or insist on severities, the important thing is to get the bug fixed, not the right severity. Optionally you can also send copies to the piuparts-devel mailinglist by adding X-debbugs-cc: email@example.com pseudo-headers.