[Destock] Computation of the product standard price

Hi,

I added a sequence field in product.cost.structure, and an order based on it.

I'd like that when we are on the product form, each time we make a change on the field Structure Cost, the standard price field value of the product is overwrite by the cost total of the structure cost with the lesser sequence value, from the structures costs referenced in the field 'Structure Cost' of the product.