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["Fabien \(Open ERP\)" <fp@xxxxxxxxxxx>]

I set it as won't fix. If someone is ready to contribute a new module,
please change the status and assign the bug to you.

Does anyone know how this feature is implemented in very simple
accounting software like sage or quickbooks ? I don't think they update
the average price, when you send back products to a supplier. If I am
wrong, I will reopen the bug.

-- 
[5.0] return products to supplier does not update price average
https://bugs.launchpad.net/bugs/610738
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Status in OpenObject Addons Modules: Won't Fix

Bug description:

When returning products to a supplier, the average standard price should be updated using the price of the packing list which is returned.

For example :
1- We have 10 products with average price = 100
2- We receive 5 products with price = 80 --> average price is calculated as (10*100+5*80)/(10+5) = 93,33
3- We return 3 products from the last packing list (the one where products cost 80)
The new average price should be 
(93,33*15 - 3*80)/(15-3)=96,67

If the return is made directly from the stock and does not concern any incoming packing list, we do not update the average price.