How to replace the open folder LOV in POXPOVPO

 Could anyone can help me?I want to replacet the open folder LOV at form POXPOVPO(Purchase Order Summary) via CUSTOM.pll.

In POXPOVPO  form, when press open folder buttom(left top corner at POXPOVPO) , it will list the folder name which is public.

Now, Ijust want to show the fodler which is created by login user, I tries so many ways, but it is not work.

Could anyone can kindly help me?Thank you.

This is my code at CUSTOM.pll

BEGIN

if name_in('system.cursor_item') = 'HEADERS_FOLDER_PROMPT.FOLDER_OPEN'  

and  event_name = 'WHEN-NEW-ITEM-INSTANCE'  

        and  form_name = 'POXPOVPO' --POXPOVPO=PO Summary