Message SAP W_MD051 - Different final recipients in delivery &1

Diagnosis
You are using an external Warehouse Management System (WMS). Thedelivery &V1& is assigned several items. Different final recipients(with the role 'UC') are assigned to these items. This is not permittedif you are using the external WMS in conjunction with cross-docking andprepacking.

System Response
This item is not seen as relevant for cross-docking with prepacking.