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Make sure your DISPLAY ONLY item types have the SETTINGS value for SAVE SESSION STATE set to YES
Otherwise, that value will never be submitted to the APEX system and (therefore) will never have a value in :P25_NOTATION or v('P25_NOTATION')
Ah, you are right, I missed that setting.
That answers my first question, any thoughts on my second question? i.e. editable form controls (checkbox, text field, select list, etc) whose values are fetched and set by the ARF process but the values are not available in session state.
Only time I've ran into that is when I misspelled the item name and/or used the wrong number (eg P25_ITEM_NAME on page 26)
Also, take a look at the DEBUG logs. That will tell you what items are actually being saved and their values.
You might get some hint there.
Finally, see if you can reproduce it on apex.oracle.com