object called 'sub product' with a one2many in editable list with a
few fields:
* product_id
* product_qty
* product_uom
When creating the mrp.production, added these products, in the finnished
products tab. kept this module in the profile_manufacturing configuration wizard.
bzr revid: nch@tinyerp.com-20081010133646-v2eb3s4p0yjy4fd8
Naresh Choksy