Comment # 1 on bug 916296 from Ancor Gonzalez Sosa

I'm not so sure that can be called a YaST issue. It just works as the package
management system is supposed to work. It install always the more up to date
version possible resolving any dependency.

If you want to make sure that two packages should always move together, that's
something that would need to be addressed in the packages themselves, so the
x-sources package depend on the very exact version of the x package forcing
them all to upgrade/downgrade together.

It's not a task for YaST or zypper to act in a special way for some specific
packages (not matter if it's the kernel) if that behavior is not described in
the dependencies of such packages.