Do  not  investigate the accuracy of, or reasons for, changes to immaterial items (e.g., city
            of birth). If the correction does  not  concern the DB, is obvious and easily explainable, and does  not  raise doubt as to whether the document pertains to the claimant, it may be considered
            immaterial.
         
         In such cases, treat the BC as if the correction had been made at the time the original
            record was recorded, and ignore the fact that the original record was altered.