OM: Apply discount on an order line

Hi Team

I am trying to apply Discount precisely Coupon while importing Order using Order Import.

I am using the below script:

INSERT INTO oe_headers_iface_all (order_source_id,
                                  orig_sys_document_ref,
                                  order_number,
                                  org_id,
                                  ordered_date,
                                  order_type,
                                  price_list_id,
                                  customer_id,
                                  sold_to_org_id,
                                  booked_flag,
                                  closed_flag,
                                  created_by,
                                  creation_date,
                                  last_updated_by,
                                  last_update_date)
  VALUES   (6,
            'PP_COUPON2',
            8745616,
            82,
            SYSDATE,
            'Standard Sales',
            80026,
            65819,
            65819,
            'N',
            'N',
            -1,
            SYSDATE,
            -1,
            SYSDATE);

----Line----

INSERT INTO oe_lines_iface_all (order_source_id,
                                orig_sys_document_ref,
                                orig_sys_line_ref,
                                org_id,
                                ordered_quantity,