The upgrade process now tests for the existence of the JadeReportWriterSchema schema before the migration begins. When the upgrade process starts up, if it finds the JadeReportWriterSchema schema in the JADE system that is to be upgraded, error 8724 (Cannot upgrade if JadeReportWriterSchema is present) is now raised and the upgrade is aborted.
For details, see steps 4 and 22, respectively, in the upgrade instruction under "Upgrading to JADE 7.1 from an Earlier Release".