How to set No Selection Attribute in List of Values?

Hi Everyone,
I'm developing an ADF form which has a List of Value(LOV) as a requirement.
I've got it working based on a View Object. However, I'm trying to set the No Selection option in the LOV and it doesnt seem to work. I've set it to the "Labelled Item - First of List" - <Please select a reason>. That doesnt seem to do the trick.
Is there another attribute I need to set?
I'm using JDev 11g.
Many thanks.
PP.

if you are using the af:selectonechoice then use it like
unselectedLabel="Please Select"but its better to debug why you are not getting this done from the VO.. can u give more information on this to solve it in the model itself..
did u check if the VO is updated properly with the changes???

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