BugTracker was refactored. In the new design, Bug is a Ticket and Messages (Bug Lines) are events following a similar design of CRM. If you update only Bug.py, it will not require use data migration (it is expected not).

If you update erp5_forge, one script is provided (at forge) to migrate old contents to the new design. BugModule_migrate in erp5_forge bt5, run the migration throw activities.

See UpdateNote to get more details of migration.

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@22737 20353a03-c40f-0410-a6d1-a30d3c3de9de