ORA-00600: internal error code, argument:[17069], [52191548],[],[],[],[],[],[]

Select REF_GEN.NEXTVal into variable_name From Dual;

DECLARE
   CURSOR next_ord IS
      SELECT orderid_seq.NEXTVAL
        FROM dual;
BEGIN
/*
** Fetch the next sequence number from the
** explicit cursor directly into the item in
** the Order record. Could use SELECT...INTO,
** but explicit cursor is more efficient.
*/
   OPEN next_ord;

   FETCH next_ord
    INTO :Order.OrderId;

   CLOSE next_ord;
/*
** Make sure we populated a new order id ok...
*/
   IF :Order.OrderId IS NULL THEN
      Message ('Error Generating Next Order Id');
      RAISE Form_Trigger_Failure;
   END IF;
/*
** Insert a row into the audit table
*/
   INSERT INTO ord_audit
               (orderid,
                operation,
                username,
                timestamp)
        VALUES (:Order.OrderId,
                'New Order',
                USER,
                SYSDATE);
END;