Incompatibilities between createrepo-0.9.8-4.el6 and RHEL5: [Errno -3] Error performing checksum

I was planning to migrate our internal yum repository to to a server
running RHEL6 when I noticed something's not working. Repositories
created using RHEL6's createrepo-0.9.8-4.el6 is not usable in RHEL5 +
yum 3.2.27 (tested using both self-compiled and RPM from
http://people.redhat.com/jantill/yum/5-from-6)

######################################################################################
# yum -d 9 --noplugins --disablerepo="*" --enablerepo=test list available
Config time: 0.039
repo time: 0.000
Yum Version: 3.2.27
COMMAND: yum -d 9 --noplugins --disablerepo=* --enablerepo=test list available
Installroot: /
Ext Commands:

  available
Setting up Package Sacks
test
                                                              | 1.3
kB     00:00
test/primary
                                                              | 1.3
kB     00:00
http://yum.telkom.net.id/test/repodata/primary.xml.gz: [Errno -3]
Error performing checksum
Trying other mirror.
http://yum.telkom.net.id/test/repodata/primary.xml.gz: [Errno 9]
Requested Range Not Satisfiable
Trying other mirror.
Error: failure: repodata/primary.xml.gz from test: [Errno 256] No more
mirrors to try.
######################################################################################


The same repo works fine on RHEL6
######################################################################################
# yum -d9 --noplugins --disablerepo=* --enablerepo=test list available
Config time: 0.033
repo time: 0.000
Yum Version: 3.2.27
COMMAND: yum -d9 --noplugins --disablerepo=* --enablerepo=test list available
Installroot: /
Ext Commands:

  available
Setting up Package Sacks
test
                                                              | 1.3
kB     00:00
test/primary
                                                              | 1.3
kB     00:00
test

          1/1
pkgsack time: 2.061
Reading Local RPMDB
rpmdb time: 0.000
Available Packages
zsh.x86_64
  4.3.10-4.1.el6
          test
######################################################################################

When I downgrade to RHEL5's createrepo-0.4.11-3.el5 (still running on
RHEL6) both RHEL5 and 6 can use it just fine. Is this a known issue?

-- 
Fajar