Comment # 17 on bug 1202116 from Lubos Kocman

Am I reading correctly that we need to republish repodata for 15.3 GA oss repo
as on of rpms physically available there is not part of repodata.

Also all updates of kernel should come from the sle update repository, as both
kernel and kernel-devel is formally inherited as a binary from SLES 15 SP3
(Update). I expect there was at least one kernel udpate since GA.

That repository is https://download.opensuse.org/update/leap/15.3/sle/

Just to eliminate some of my thoughts... Do you have

vendors=openSUSE,SUSE,SUSE LLC <https://www.suse.com/>

in /etc/zypp/vendors.d/00-openSUSE.conf ?

As in 15.3 we basically made SUSE/openSUSE vendors interchangable without
--allow-vendor-change option.

Thank you