[1.1Milestone1] Importing a large .xar file

Hello, I'm trying to migrate from xwiki 1.0 to 1.1.milestone 1 engine using the export/import feature. I'm configured to use a MySQL database on both sides. My exported .xar file is about 60Mo. I managed to go through following errors: - limit of 10Mo from XWiki as attachment size - limit of 1Mo as packet max size for MySQL Now I'm getting the following error while trying to attach the Backup.xar file in my new wiki instance: "java.sql.BatchUpdateException: Data truncation: Data truncated for column 'XWA_CONTENT' at row 1" Any ideas ? The .xar file do not get correctly attached after this. Best regards, Jérémie