Which materials have a negative quantity in a bill of material or in a recipe?

Materials that have a negative quantity in a bill of material or in a recipe are those that are produced in addition to the main product during a production process. They are either sold or disposed of, and their costs are apportioned among the main product and the co-products. By-products are materials that have a low value compared to the main product and are usually not planned in advance. Co-products are materials that have a high value compared to the main product and are usually planned in advance. Waste products are materials that have no value and are discarded or recycled. References: Bill of Material (BOM), Test sap pp 2020 s4 hana - DAYPO