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It is known pain when you decided to move into new version of OpenERP but realized that you cannot due to incompatibility of DB(s) between versions.
The simple approach in such a case is to sign a support contract with OpenERP company as they will take care of the migration script but if you don't want to do so, there is another way but it mighty worth the support contract in some cases.
It is known bug as follows: https://bugs.launchpad.net/openobject-addons/+bug/706227