Full_Description

   If the organization of the output file is to be different from
   that of the input files, you must specify the new organization.
   If you do not specify file organization, the default for record
   and tag sorts is the organization of the first input file. If you
   do not specify file organization, the default organization for
   address and index sorts is sequential.

   Use the /SEQUENTIAL qualifier when the default is not sequential
   file organization and you want an output file with sequential
   file format.