RE: Incorrect SQL statement

Put the column name in quotes like "RESULT" in the query or use a table alias with it like:

    EXEC SQL
       SELECT
             A.result
       INTO
             :mfcustomers-result:mfcustomers-result-NULL
         FROM mfcustomers A
        WHERE (A.cust_no = :mfcustomers-cust-no)
      END-EXEC