Compatibility of directory files

With the transition from ARCHIVE to HSMS, existing ARCHIVE directory files can be included in new HSMS backup archives that are to be created. If the directory file has been included with the SAVE-FILE-STRUCTURE= *SEVERAL-SVID archive attribute and backups have been created under HSMS, reverting to ARCHIVE using this directory file is no longer possible. In general, archive directories of backup archives in SEVERAL-SVID structure as well as version backup, migration and long-term archives should under no circumstance be used under ARCHIVE.