New configuration parameters have been added in 15.0.3. If a downgraded server is booted using the 15.0.3 configuration file, the new options cause the message ‘Unknown parameter’ the unknown options are reported the first time the server is booted. These messages can be ignored because the configuration file is rewritten without the unknown options.Running installmaster from the release area of the server to which you downgraded removes configuration parameters, that belong to 15.0.3, by deleting sysconfigures rows for configuration parameters that do not exist in syscurconfigs. After running installmaster the error messages no longer appear when you start the server.
