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[invitu <610738@xxxxxxxxxxxxxxxxxx>]

Nhomar, our customer who is strongly impacted by this bug recently subscribed a warranty contract with OpenERP SA.
It will soon be registered as a bug included in the warranty (we both agree that the actual behaviour of product returns to suppliers are incorrect)

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https://bugs.launchpad.net/bugs/610738

Title:
  [5.0] return products to supplier does not update price average

Status in OpenObject Addons Modules:
  Confirmed

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.