[FW][FIX] purchase_stock: use correct picking when updating purchase qty #161700
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Description of the issue/feature this PR addresses:
In systems were POs can have multiple open pickings, updating the Purchase quantities can lead to errors due to the current behaviour.
Current behavior before PR:
Before the fix, the picking used to create the new stock moves resulting from changes in the purchased quantity is simply taking the first available picking of the Purchase. This causes problems when you handle Purchase Orders with multiple open pickings, as the correct picking to use when the quantity is updated is not always taken.
Desired behavior after PR is merged:
After the fix we give priority to evaluate open pickings already related to the line we are updating. We fallback to the same behaviour as before is none is available.
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Forward-Port-Of: #161452