reading a file organized by OPNQRYF

Just another quick question from a guy who'd really rather not have to fart
around with this stuff.... :)   I'm converting a bunch of flat file FMTDTA
stuff to use OPNQRYF instead.

when reading a file in cobol that's been sorted via opnqryf, is there
anything I need to worry about as far as COBOL syntax?

this is what I have:

OVRDBF     FILE(HISTRY4) SHARE(*YES)
OPNQRYF    FILE((HISTRY4)) QRYSLT( +
                  'HPEROD *EQ ' *CAT &PERIOD *BCAT  +
             '*AND LMRKTC *NE "00" +
              *AND HITEM  *NE 0')   +
             KEYFLD((HITEM) (LMRKTC))

and in my cobol:

SELECT HISTRY4 ASSIGN TO DATABASE-HISTRY4
     ORGANIZATION IS INDEXED
     ACCESS MODE IS SEQUENTIAL
     RECORD KEY IS EXTERNALLY-DESCRIBED-KEY
     FILE STATUS IS FILE-STATUS-01.

OPEN INPUT HISTRY4

READ HISTRY4 AT END
  MOVE "Y" TO EOF-HISTRY4.

CLOSE HISTRY4

If I'm missing something obvious, I'd appeciate the heads up - I'm
particularly concerned about the ACCESS MODE and RECORD KEY clauses of the
SELECT Statement.  - indexed, sequential with external key - (not the
file's natural key)

I'm changing a ton of these, and I won't have a chance to test till I'm
done, and I'd like to get it right the first time.

Thanks a ton,

Rick