In Discrete Manufactoring how to handle leftovers that can be sold

Summary:

Our production process involves cutting metal parts. The leftovers from this cutting, pieces of iron, are sold by weight as "scrap" and the value of this sale is the "cost" that will be deducted (negative transaction) from the cost of the final item. In this way we are able to get the final product to a cost value that is closer to the real thing. We can't just take into account the quantity of raw materials used in the final product, because the cost of raw materials is higher than the cost of scrap metal sold by weight.

Currently in eBS we do this process with a "scrap item" that we assign a negative quantity in the BOM.