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** Attachment added: "Screenshot-Cost Structure.png"
   https://bugs.launchpad.net/openobject-addons/+bug/689868/+attachment/1773537/+files/Screenshot-Cost%20Structure.png

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https://bugs.launchpad.net/bugs/689868

Title:
  Report "product cost structure" doesnt calculate components costs

Status in OpenObject Addons Modules:
  Invalid

Bug description:
  Products A, B, C and D.
standard prices are 1€.

BoM for Product A: 1B + 4C 
BoM for product B: 10D 
(so one A should be composed of 10D + 4B, and in fact that's what the procurement orders do)

When calculating A's "product cost structure" report, 
------------ I'm awaiting:
Costs A :
  1 x costs B
      10 x costs D = 10 x 1€
  4 x costs C = 4 x 1 €
Total costs for one A : 14€

------------ BUT INSTEAD OF THIS, IT ...
... calculates A costs using A's BoM (A= 1B + 4C)
... doesn't calculate B's costs using B's BoM (B=10D).
     Instead of this, creates a new B's "BoM components", with no other products in it. 
     Cost of one B = 1 x standard price of B = 1€
Costs A = 1x standard price of B + 4x standard price of C = 1€ + 4€ = 5€

------------ Note:
The report "BoM structure" is correct, it gives :
A
    1B
        10D
    4C

Thanks in advance for correcting this bug (or for explanation if I'm understanding something wrong)