sl6 x86_64 repodata possible out of sync

[olli hauer]

Yesterday I tried to install a sl6-x84_64 system
with kickstart and @Base which failed because of a
missing rpm.

Looking at the mirrors there is a package
sl-release-notes-6.4-1.noarch.rpm but no
sl-release-notes-6.4-0.noarch.rpm