PPA Question - Distribution Field

[Will Daniels]

Hi, I have built a source package for which I want to build binary 
packages for both gutsy and hardy.  The Debian Policy Manual 
<http://www.debian.org/doc/debian-policy/ch-controlfields.html#s-f-Distribution> 
suggests that I should be able to use a space-separated list of 
distribution names in the changelog (and thus .changes file) to specify 
this.  However, the package was rejected by launchpad saying:

"Unable to find distroseries: hardy gutsy"

Before this, I had tried just rebuilding the same package with the same 
version for gutsy, but launchpad didn't like that either (I had 
originally build and uploaded the package for hardy only):

"MD5 sum of uploaded file does not match existing file in archive"

It doesn't seem right to change the package version just to use it for 
another distribution, and I'm not sure whether launchpad would keep my 
original hardy package in that case either.  So, what is the correct way 
to do this?  Do people normally change the package version when 
backporting?  Is it just a limitation of the PPA system?

Thanks for any help in advance,
Will
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