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Enterprise Manager validates job credentials as follows: | 
  | If the job is set to override preferred credentials, the credentials entered in the job property sheet are used. | 
  | Otherwise, Enterprise Manager uses the preferred credentials the administrator set for the target(s). | 
  | If no preferred credentials have been set, Enterprise Manager uses the administrator's <DEFAULT> credentials for the corresponding service type. | 
  | If no <DEFAULT> credentials have been set, Enterprise Manager uses empty credentials, and the job may fail if the target requires credentials. |