[FIX] mrp: Post inventory button without finished product

Let's consider P1, P2 and P3 with a cost=1$, three stockable products where
P1 and P2 are in the same product category PC1 with a Stock valuation
account = SVA1 and P3 is in the product category PC2 with a Stock valuation
accout = SVA2. PC1 and PC2 are set with costing method in real price and
Inventory valuation = perpetual(automated).

Steps to reproduce this issue:

-Create a BOM where P3 is composed by 1 P1 and 1 P2
-Create a PO for P1 and P2 with a cost of 5$ for each one
-Create a MO to produce 1 P3
-Check availability
-Insert manually the consumed product(1 P1 and 1 P2)
-The button "Post Inventory" appeared, clicked on it
-Check the general ledger, two moves with debit=5$ has been created
for P1 and P2 in PC1(it's ok)
-Produce the MO and click on "Post Inventory" again
-Check the general ledger, two moves have been created, one with a credit of 2$
on PC1 and one of debit of 2$ on PC2(it was wrong)

The expected moves for the last step is:
a credit of 10$ on PC1 and a debit of 10$ on PC2 because the purchase price must be
considered as P1 and P2 are in real price.

NB: Everything is ok if the button "Post Inventory" is clicked after the production.

opw:741748

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