Is yum not allowed on RHEV servers?

OK, I learned that I must use rhevm-upgrade to upgrade rhevm (thanks, Anitha) and that works fine.  But can I no longer use yum to update other packages on the system?  It looks like the metadata for the rhevm 3.0 beta channel includes versions of packages that are not available.

For instance, if I try to update yum itself with "yum update yum", yum tells me that it will update my existing 3.2.29-17 to 3.2.29-22.  It appears to be downloading the new rpm twice and then fails with:

Error Downloading Packages:
  yum-3.2.29-22.el6.noarch: failed to retrieve getPackage/yum-3.2.29-22.el6.noarch.rpm from rhel-x86_64-rhev-mgmt-agent-6-beta
error was [Errno -1] Package does not match intended download. Suggestion: run yum --enablerepo=rhel-x86_64-rhev-mgmt-agent-6-beta clean metadata

I'm also having this problem on my RHEL61 host machines that are being managed by RHEVM since they are subscribed to the rhevm 3.0 beta channel.