EVENT-REPORT messages are always sent as unconfirmed ROIV messages; these ROIVs do not represent linked-replies, and it is not possible to include any error information in them.

A SET ROIV request sent to the VTAM topology agent will result in either an ROER or an RORS message, depending on the specific data in the request.

A DELETE ROIV request sent to the VTAM topology agent will always result in an ROER response message.