Reading a session variable from a dynamic action

I have a select list on a page and a button next to the select list. The button calls a dynamic action which opens a page and sends the value in the select list. The page is not submitted. The DA has a step with a dummy PL/SQL block that submits the select list item. Then the page is called with the select list in the URL.
The value is not being sent. If I go into edit mode then run the page again then the correct value is sent.
When I look at session in Administration the select list is in session and set properly but is not sent unless the page is submitted.
Why if it is in session is it not being passed correctly? What does submitting the page do other than update session?

Hi,
could you share the exception trace ?
Frank

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