[Bug 58144] Re: Backport is rejected if an older backport is already there

[Colin Watson]

Note further that changes to released distributions are subject to
manual approval anyway, and backports are only relevant to released
distributions. So forbidding updates from superseding backports because
it might have been accidental or something doesn't really make a lot of
sense to me.

-- 
Backport is rejected if an older backport is already there
https://launchpad.net/bugs/58144