yumdownloader command cannot download source rpm file from 'rhel-source' repository on ppc architecture.

Issue

• yumdownloader command cannot download source rpm file from 'rhel-source' repository on ppc architecture.

# yumdownloader -v --archlist=src --source sssd-1.8.0-32.el6
Loading "rhnplugin" plugin
Loading "product-id" plugin
Config time: 0.359
This system is receiving updates from RHN Classic or RHN Satellite.
Looking for repo options for [main]
Looking for repo options for [rhel-ppc64-server-6]
Repo 'rhel-ppc64-server-6' setting option 'enabled' = '1'
Repo 'rhel-ppc64-server-6' setting option 'gpgcheck' = '1'
Repo 'rhel-ppc64-server-6' setting option 'timeout' = '120'
repo time: 0.000
Setting up Package Sacks
rhel-ppc64-server-6                                                          | 1.8 kB     00:00    
rhel-ppc64-server-6/primary                                                  |  22 MB     00:44    
rhel-ppc64-server-6                                                                     16522/16522
pkgsack time: 116.263
No source RPM found for sssd-1.8.0-32.el6.ppc64
Nothing to download