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As specified in the documentation, "every single bulk operation is executed in its own transaction and if the operation fails, it is rolled back.". This is by design and at that time you cannot control the bulk operations transactions.
The idea is that any bulk operation affects multiple records in the database and these data modifications should be consistent.
OpenAccess ORM is now Telerik Data Access
. For more information on the new names, please, check out the Telerik Product Map