The specified density cannot  be  translated  to  an  equivalent
  multiple tape density value

  Explanation:   A  multiple  tape  density  value  has  not  been
  specified for this tape device even though multiple tape density
  values are supported for this device.  Since the specified  tape
  density  value  cannot  be  translated to an equivalent multiple
  tape density value, a multiple tape density value  will  not  be
  used for this device.

  User Action:  Consider specifying a multiple tape density  value
  for  this  device using the DATA_FORMAT qualifier instead of the
  DENSITY qualifier or specify a value with the DENSITY  qualifier
  that can be translated to a multiple tape density value.