Special condition type &2 for recycling partner &1 cannot be settled

What causes this issue?

The system found the special condition <ZH>&V2&</>:
<ZH>&V3& </>
while doing the declaration.

System Response

The Recycling Partner &V1& has with the current settings no calculation
according to special conditions. Therefore the quantity flow with
special condition &V2& will be ignored in the declaration.

How to fix this error?

Check the article maintenance for Recycling Partner &V1& and special
condition &V2& (-> REA Infosystem). Please check also the maintenance
of the special conditions in the REA-Customizing

Error message extract from SAP system. Copyright SAP SE.