After you set the replication site version to a new level, you cannot downgrade any Replication Servers in the replication system below that version level, or install a Replication Server below that version level.
For example, if you upgrade to version 15.7.1 SP100, Replication Server may write some version 15.7.1 SP100 commands to the inbound queue after the upgrade. Versions of Replication Server earlier than 15.7.1 SP100 cannot recognize the version 15.7.1 SP100 commands.
To return to an earlier software version, reinstall all Replication Servers and re-create your replication applications.
If you do not want to use new features that depend on the site version, do not set the Replication Server site version after the upgrade. You can then downgrade to an earlier version if needed.
If you plan to downgrade in a directory other than the existing Sybase version directory, verify that the sql.ini file is accessible.
If necessary, downgrade the RSSD for each Replication Server you are downgrading. You must downgrade the RSSD using the predowngrade— that is, the most recent—version of rs_init.
If the Replication Server uses an ERSSD, verify that the Replication Server configuration file contains the erssd_release_dir and erssd_start_cmd parameters. Ensure the values for these parameters should be the same as the values before upgrading.