Excerpts from Markus Falb's message of Sun May 23 13:19:39 -0400 2010:
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Hi,
Some time ago I encountered some problems with the --rpm-list option for the cobbler repo command. As I understood, the --rpm-list option do not work with foreign architectures, e.g. if cobbler server is i386 one cannot make a repo for x86_64. https://fedorahosted.org/pipermail/cobbler/2009-June/004566.html
Can you try again with cobbler 2.0.4? There have been some improvements in there that might help you.
The related ticket was closed without a explanation why: https://fedorahosted.org/cobbler/ticket/153
This might be because it is going to be a bug with yum that cobbler can't really fix. It shouldn't have been closed without comment, but if yum doesn't support what you are trying to do, there is nothing that cobbler can do about it.