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Refresh does not support on ITEMs. see documentation http://docs.oracle.com/cd/E37097_01/doc/doc.42/e35125/advnc_dynamic_actions.htm#sthref2814
Refresh - Triggers a refresh of the affected elements. Note that not all elements support a refresh, you can use it for interactive reports, classic reports, charts, list view and all item types with cascading LOV support. Plug-ins might support this action as well.
You should use Page Items to Return under your Execute PL/SQL Code true action to refresh the items value from the session state