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

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

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