In the event of canceling a job, the project the job was sent from remains locked. In this scenario, you will need to remove the job from the project to unlock the locked objects. This is done from the project root's property panel by selecting the job to remove and clicking Remove Job and Unlock.
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This permanently removes the job information from the project and unlocks the objects. Only do this if you no longer wish to merge the jobs results back into the project. Once the project is saved this cannot be undone the deleted job will no longer merge into the project.
Note: A user can only delete jobs that they have submitted from the JMS queue. Only the Admin has the ability to delete any job from the queue.