Comment # 11 on bug 1005386 from Leonardo Chiquitto

(In reply to Peter Simons from comment #10)
> (In reply to Leonardo Chiquitto from comment #8)
> > 1.6.1 was accepted into Factory, but zypper up/dup will of course never see
> > it as a potential update candidate.
> 
> It should install the new version as a *downgrade*, though? Tumbleweed users
> should get the new version installed, it's just presented in a slightly
> misleading way.

As long as 1.51 is already installed or available in some repository, 1.6.x
will never be installed.

> Unfortunately, packman still offers fdupes-1.51, too, so the downgrade won't
> happen for people who are subscribed to that repository as well as Factory.
> The edited spec file from https://build.opensuse.org/request/show/443905
> should remedy that issue though.

No, it won't. And this is wrong: the package is obsoleting itself.

It's not really possible to reset the version number like this in a clear way.