That's not part of the Sales Report, and I'm pretty sure that's not part of the core either. Is this a 3rd party module you installed? Regardless, this isn't the thread you need.
It's been a known problem for some time. Most Dev team effort has focused on the catalog side, and the reporting etc has remained woefully short in the meantime.
However there is light at the end of the tunnel starting in 1.4, which includes inventory tracking at the attribute level. You can read about it in the project roadmap.
Until then you're just going to have to sit tight; I have no plans to write code that will be outdated in the next 12 months or less.
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