SAP Message USMD2260 - Data model &1: 'Attachments' not possible for entity type &2

Diagnosis Entity type &v2& does not allow attachments because the checkboxAttachments is not selected for thisentity type in data model &V1&. Procedure Select the Attachments checkbox for entity type &V2& in datamodel &V1&, or select an entity type for which the Attachmentscheckbox is selected.