Description of problem:

Upgrade scenario
/etc/sysconfig/rhn/satellite-upgrade/rhn-satellite-5-upgrade-scenario-1b.txt
Step 6:
6. Update the RHN Satellite (connected RHN Satellites only):
   up2date -p && up2date -uf (on 4AS)
   yum check-update && yum upgrade (on 5 Server or 5 Client)
doesn't upgrade packages on RHEL5

Version-Release number of selected component (if applicable):
rhn-upgrade-5.3.0.24-1.el5sat.noarch

How reproducible:
always

Steps to Reproduce:

1. # yum check-update && yum upgrade
Loaded plugins: rhnplugin, security
Skipping security plugin, no data

spacewalk-base.noarch  0.5.23-29.el5sat  redhat-rhn-satellite-5.3-server-x86_64-5
spacewalk-base-minimal.noarch
                       0.5.23-29.el5sat  redhat-rhn-satellite-5.3-server-x86_64-5
spacewalk-cypress.noarch
                       0.5.23-29.el5sat  redhat-rhn-satellite-5.3-server-x86_64-5
spacewalk-grail.noarch 0.5.23-29.el5sat  redhat-rhn-satellite-5.3-server-x86_64-5
spacewalk-html.noarch  0.5.23-29.el5sat  redhat-rhn-satellite-5.3-server-x86_64-5
spacewalk-java.noarch  0.5.44-50.el5sat  redhat-rhn-satellite-5.3-server-x86_64-5
spacewalk-java-config.noarch
                       0.5.44-50.el5sat  redhat-rhn-satellite-5.3-server-x86_64-5
spacewalk-java-lib.noarch
                       0.5.44-50.el5sat  redhat-rhn-satellite-5.3-server-x86_64-5
spacewalk-moon.noarch  0.5.23-29.el5sat  redhat-rhn-satellite-5.3-server-x86_64-5
spacewalk-pxt.noarch   0.5.23-29.el5sat  redhat-rhn-satellite-5.3-server-x86_64-5
spacewalk-sniglets.noarch
                       0.5.23-29.el5sat  redhat-rhn-satellite-5.3-server-x86_64-5
spacewalk-taskomatic.noarch
                       0.5.44-50.el5sat  redhat-rhn-satellite-5.3-server-x86_64-5

2.# echo $?
100

(nothing was upgraded)

3. 
# yum check-update > /dev/null; echo $?
100

Actual results:
Packages were not upgraded. 2nd command (after &&) wasn't called at all.

Expected results:
If there're packages to upgrade, they should be upgraded.

Additional info:
Make sure, if the 4AS variant behaves correctly or the same:
up2date -p && up2date -uf