SAP Message USMD2055 - UI element &1: UI element type 'Sets' not possible for entity type &2

Diagnosis You want to create UI element &V1& with Sets as the UI elementtype. Entity type &V2& does not allow sets since theSets checkbox is not selected for this entitytype in the data model. This means that you cannot create a UI elementfor sets for the entity type. Procedure Choose an entity type for which the Sets checkbox is selected, orselect the Sets checkbox for entity type &V2& in the data model.