Starting on open ERP, I do not know how to deal with certain products of certain suppliers. They give us products available in our shop and we pay them only when these products are sold "deposit for sale". If I specify a purchase price on these products, the system understands that I have already paid those products ... which creates an accounting problem because I will not pay them maybe for a year ... should I create another stock that the one I use with my normal suppliers of my shop (Buy then sale)? a subcategory? other?