See the following forum post regarding variant qty on hands:

http://www.smith-consulting.com/forums/forumid/1/threadid/3254/scope/posts.aspx

We have had several meetings on this internally and we can implement decrementing the qty on hand in the variant table and it work when you have only one variant defined for a product. But when you have multiple variants defined for a product decrementing the qty on hand for each variant doesnt work with the current table structure. Right now the variant qty on hand is in the variant table and when you have more than one variant for a product you need to be able to assign qty on hand for variant combinations like the large blue shirt. This requires another table to be created where you can associate a qty on hand with multiple variants. It in the roadmap but not a small change.

-Scott

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Scott Kelly
Project Manager