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What I have done is to define a radio group page item (:P3_BEVERAGE) with "DISPLAY EXTRA VALUES" set No and "DISPLAY NULL VALUE" set No. List of values definition is STATIC2:COFFEE;COFFEE,TEA;TEA,NA;NA
Then I have a Before Header process (SET_BEVERAGE_VALUE) to set the default value:
Does that help?
Begin IF :P3_BEVERAGE IS NULL THEN :P3_BEVERAGE := 'NA'; END IF; End;
The effect of using the process code to set the value versus using the default value of the page item, as I understand it, would be that the process would place the value into the session state while the default value is not placed into the session stage until after page submit. So, you have a choice of methods depending on what you want to happen.