Hello everybody, I am currently working with the sales module, but I have doubt, it happens that one product can have (on its inventory options) 3 different operations (Manufacture, Buy, Make to order).

In the case I have a product with some stock in inventory which can be bought, if I only select Buy, when I make a sale of this product, the system just make the sale and take the products from the stock leaving the amounts in negative numbers in case the sale needs more products than is in existence in the stock.

In the case I select Buy and Make to order, the system generates a purchase order by the exact number of products I am selling ignoring the products in stock . How can I make the system takes the existing products from the stock and create a purchase order for the products I still need for the sale?

I mean, suppose I have a product named A, there is 8 of these products in stock, but I need to sale 10 products, I need that the system can be capable of discount the 8 products from the stock and create a purchase order for the value of 2 products to complete the order.

Can anyone help me?