and P2_FOO in the Page Items to Submit region attribute. The DA simply uses the Refresh action when P2_FOO changes. P2_FOO has SSP set (checksum required). The page loads fine (because the DA is set to not fire on page load). But when P2_FOO is changed, the report region dissapears! Using Firebug to dig deeper shows a error Attempt to save item P2_FOO in session state during show processing, item has Internal Only protection.
select :P2_FOO c1 from dual