Cross version RESTORE is not possible for by-area or incremental
  functions

  Explanation:  A by-area restore operation is not permitted  from
  a  backup  created  under  an  earlier  software  version.  This
  function requires recovery from the after  image  journal  file,
  and  that  is  not  possible  across  versions.   An incremental
  restore operation is not permitted from a backup  created  under
  an  earlier  software  version.  The full restore operation that
  preceded this request performed an implicit  convert  operation.
  This  updates  the  database  and  invalidates  the  incremental
  restore operation.

  User Action:  If this operation can not be avoided, the recovery
  must be performed under the version that the backup was created.
  That usually will require a full restore operation, and possibly
  an  incremental  restore  operation  and  a  recover  operation.
  Updates made under the current software version will be lost.