Comment 17 for bug 610738

@Fabien

Thanks for you interest in this bug and for the time you spend to reply.

Please read the article again : it speaks about FIFO, LIFO, average price and stock accounting in general.
The remark I underlined at the end of the article is located outside the FIFO / LIFO / average parts. It concerns the returns to suppliers in general case, whatever the method of stock accounting.

The second line of the article explains the global rule : "En principe, tout élément stocké sort des magasins au prix auquel il était entré." => The return to supplier goes out with the price it had when it got into the stock, no doubt about it.
Then, if average method is used, the cost price should be recalculated.

In general, average method is used by companies who want to have very detailed control for their margins and do not accept approximations.

BTW, FIFO and LIFO do not interfere with returns to suppliers : when you return products to suppliers, whatever you use FIFO, LIFO, average or other method, you always return an identified product because "you have it in your hands" (it's not the same with returns from customers because when the products are at the customer's place, you lose the traceability for them).

Please believe this article, moreover, it is good sense and logical. Trust me, we will have more complicated discussions when we will talk about return to suppliers for products that have been imported (with landed costs that could be not refunded when you re-export the product back... :-))

About #9, I finally do not agree with the two propositions of setup you proposed : The aim of this bug starts at the time when the product is already in the stock, whatever the workflow that has been used to get it in. As long as the average method is proposed in the core, I strongly think that this bug should be fixed in the core because OpenERP should not make errors by default and actually, it does ! (I repeat several times the same arguments, am I too old or am I misunderstood ?)