virtual stock / 2nd location

[seansan]

Hi, I just came across your extensions. We have a simpel request:

• create 2n stock location (call it remote_stock or virtual_stock)
• remote_stock is updated through feeds (not a problem; just saying ;)
• when order is placed: pick from local_stock first then fall back on remote_stock
• we sell both simple and configurable products (shirts in sizes)
• order should 'know' which product comes from where
• order should know that 'at least 1 product' is from remote (set flag) - so we can pickup on frontend, transactional emails, or in cart
• credit memos/ returns are returned to local_stock

I know this is a fairly open question. But it has been bugging me for a while: what basis or solution shall I use to add this functionality? So it is not necassarily so that we need multi inventory: just 1 virtual location)

Tips, advice or experience ;0 very welcome