Session state of page item different from one region to another region

hi,
on one particular page I have two regions. A page item (LOV pop-up) is set in the first region. I leave this region with a button and jump back with a branch to the same page. The page item has now the selected value (as is shown by session state window). So far so good.
The second region (SQL query type) uses this page item. However, for some reason the page item is NULL in that second region.
Can anyone explain this behavior ?
ron

thanks Joel,
I did already what you suggested. The title in region 2 is evaluated to the same value as in region 1.
The SQL query (that actually runned with identical syntax before) is:
select bla from blatable where bla = :P920_RU
this generates:
report error:
ORA-12801: error signaled in parallel query server P000
ORA-01741: illegal zero-length identifier
So apperently the bind variable is evaluted to (or cached as) NULL.
I noticed something strange in the session window. There are several page items in the application. All of them are listed in the 'Session State' region. The page item that makes problems is the only one that is also listed in the 'Page Items' region. It is even listed when I start the session window from another page. Weird.
any other ideas ?
Actually, how could you possibly clear session state between rendering two regions ?
Ron

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