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ABAP_MSG - ICF Processing Messages sent during ICF processing>, that is, when a HTTP/HTTPS query or SMTP query is handled by an HTTP request handler>, behave in the same way as in RFC processing>. Programs or procedures called in the handler are executed in the service context and their messages behave accordingly.
Latest notes: Dialog processing> or list processing> can only take place for an ICF server if the Service Data -> GUI Link> setting for the service is set to Yes> in the transaction SICF>>. Messages of the types I>, S>, and W> are always ignored by default and messages of the types A>, E >, and X> always terminate processing followed by a database rollback>. ABAP_HINT_END