Co-products not supported for material & &

What causes this issue?

You want to mark material &V1& as a co-product. However, in plant &V2&,
this material is not defined as a co-product.

System Response

The system checks the material master (<LS>MRP 2 detail screen</> to
see whether the material is defined as a co-product.

How to fix this error?

You can only enter the material as a co-product in plant &V2& once you
have set the indicator in the material master which defines the
material as a co-product for this plant.

Error message extract from SAP system. Copyright SAP SE.