[Stackoverflow] [Progress OpenEdge ABL] How to fix Create buffer Query error for progress 4gl?

[Thiru]

I am new to progress 4GL. I have written logic for buffer by adding multiple tables into a single query and finding the records from another table by using table field names. I am not sure why I am getting errors. Please help to change the logic

DEFINE VARIABLE ix AS INTEGER NO-UNDO.
DEFINE VARIABLE qh AS HANDLE  NO-UNDO.
DEFINE VARIABLE bh AS HANDLE  NO-UNDO.
DEFINE VARIABLE fh AS HANDLE  NO-UNDO EXTENT 10.
DEFINE VARIABLE cQuery AS CHARACTER NO-UNDO.

CREATE BUFFER bh FOR TABLE "Customer, Invoice".
CREATE QUERY qh.

ASSIGN
    cQuery = "FOR EACH Customer NO-LOCK, EACH Invoice WHERE Invoice.Cust-Num = Customer.Cust- 
 Num NO-LOCK: ".

qh:SET-BUFFERS(bh).
qh:QUERY-PREPARE(cQuery).
qh:QUERY-OPEN().
qh:GET-FIRST().

 /* Field Invoice.Cust-Num is already defined in cQuery*/

  FIND Order WHERE Order.Cust-Num =  Invoice.Cust-Num NO-LOCK  NO-ERROR.
IF NOT AVAILABLE Order THEN DO:
  FIND Ref-Call WHERE Ref-Call.Cust-Num = Invoice.Cust-Num NO-LOCK NO-ERROR.
DISPLAY Ref-Call.Cust-Num.
END.


qh:QUERY-CLOSE().
bh:BUFFER-RELEASE().
DELETE OBJECT bh.
DELETE OBJECT qh.

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