If you have performed extensions on transaction tables in earlier releases, you must regenerate dbclasses. However, if you ran the dbclassgen target as part of the history migration you can skip this step.
To perform the dbclassgen from Release 8.0 (or later) to Release 9.4 run the command shown for the migration type you are running.
${ANT_HOME}/bin/ant -Druntime=<INSTALL_DIR> -Druntime.old=<INSTALL_DIR_OLD>
-f buildmigration.xml -logfile <logfile> -Dtarget=dbclassgen migrate
The command regenerates the dbclasses and updates the entities JAR.
The *.done file created in the 9.3 status folder for the dbclassgen task is ant_dbclassgen.xml.done.