The migration plan is integrated in the migrationPlan.xml folder as a resource in the arcm_datalayer_migration_migsteps.jar library and is located in the com.idsscheer.webapps.arcm.dl.datamigration package. Changes and extensions are possible in the file migrationPlan.xml, as long as you generate a new library arcm_datalayer_migration_migsteps.jar with the modified class.
In CTK you need the sources of the standard migration in order to carry out custom adjustments. Subsequent to this, a library is created from these modified sources, which replaces the standard library.
For detailed information on how to adjust migration of customer-specific databases in the CTK, refer to CTK user guide chapter Implementing custom database migration steps. You can download the user guide together with the CTK from the ARIS Risk & Compliance Manager area in Partner Business Portal.