cannot optimize -- AIJ file <str> backed up via a no-quiet-point
  backup

  Explanation:   An  AIJ  file,  which  was  backed  up   with   a
  no-quiet-point   backup,   cannot   be   optimized,   because  a
  no-quiet-point backup can leave incomplete  transactions  in  an
  AIJ   file.    AIJ   optimization   cannot   handle   incomplete
  transactions within an AIJ file.

  User  Action:   No  user  action.   This  AIJ  file  cannot   be
  optimized.