Short description: When a system has a package that is obsoleted by some package the channel up2date is running against, up2date does not offer to upgrade it. Long description: I was running up2date-2.7.2-7.x.6 (the one from 7.2) on a mixed 7.1/7.2 system. The system had (among other things) the sane-1.0.3-10 package (from 7.1). Up2date did *not* offer to upgrade it to sane-frontends. P.S. The system also had xsane-0.62-4 and xsane-gimp-0.62-4 (from 7.1) installed. Up2date wanted to upgrade them to new xsane and xsane-gimp from 7.1 but failed complaining that a bunch of files from sane-backends (added as a depenency of the new xsane* packages) conflicts with the sane-1.0.3-10 (the one that is obsoleted by sane-frontends which went unnoticed by up2date).
This will be added for the next release of the up2date client.
Make that, the next major release.... 3.x.something probabaly
version in limbo should be supporting this now, so closing this out.