Comment # 10 on bug 1173582 from Vladimir Nadvornik

(In reply to Vladimir Nadvornik from comment #5)
> So if fixing obsoletes of sles-release package does not fully fix this
> issue, you can re-test with zypper-migration from
> https://download.opensuse.org/repositories/zypp:/plugins/openSUSE_Leap_15.2
> but I think it is not necessary.

According to bug#1173686 an update of zypper-migration package in Leap is
needed too. I will look into it.