How to add new line for the existing po via interface

Hi Experts,

By referring to

How To create/update a Standard Purchase Order/Blanket Purchase Agreement/Quotation through PDOI process (Doc ID 1406003.1)

i have created the below insert script. But the import program is not selecting the data. Could you please verify and suggest what is missing and why the data is not picked by the program. There is no error in the error table.

Insert into PO_HEADERS_INTERFACE
(INTERFACE_HEADER_ID,
PROCESS_CODE,
ACTION,
po_header_id,
CREATION_DATE)
VALUES
( po_headers_interface_s.NEXTVAL,---INTERFACE_HEADER_ID,
'PENDING',---PROCESS_CODE,
'UPDATE', ---ACTION,
6450597 , --6450600,
SYSDATE ); ---CREATION_DATE

Insert into PO_LINES_INTERFACE