How to create a display value and a return value for an item

Hi! I have an item on a form. I want the default value for my item to be :":APP_USER", but the return value, to be the id of my user. I tried to create a PL/SQL Expression for the default item, but it doesn't work. What do I miss?
It should be something like this, but it's not.
begin
select first_name || ',' ||last_name as "Employee",
id_employee -- display value,return value
from employees
where id_employee = :APP_USER;
end;
Does anyone know?
Thanks!
Vitaly

Hi VItaly,
Display value and return value concept applies very well in case of a Combo box if i am correct, I don't know what type of item is your's.
But any way, you can have a workaround like,
Create a hidden item such that it's default value should be ID of the user which can be get from db by using :APP_USER.
Use the this item for your references.
I think this will meet your requirement.
Thanks
Kumaraswamy.

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