What is the difference between the BACK_PAGE_URL and PAGE_URL parameters?
In Show mode (the mode for rendering portlets), use PAGE_URL to return the user back to the page from which they came. BACK_PAGE_URL is generally not used in this mode. In Customize, Edit Defaults, Help, and About modes, use PAGE_URL to redraw the Customize/Edit Defaults/Help/About screen. Use BACK_PAGE_URL to return the user back to the page from which they came. So, in your portlet.show procedure, you should typically have the following line in the section for mode_show: wwui_api_portlet.draw_portlet_header(… p_back_url => p_portlet_record.page_url …) This causes the customize link to render correctly.