Can't use validation to verify item

Hi , I'm try to learn htmldb.
I've defined a validation check (NOT EXISTS), with sql statement :
select 1 from TESTS where ID = :P_TESTID
From some reason , I can't make it work. I feel I'm missing some simple here .
I've 2 questions :
1. Can anyone reference the a working example of not exists validation ?
2. If some one can look at application 11875 (page 2) , and give me a clue ...
Thanks for your time

Hi,
in your statement:
select 1 from TESTS where ID = :P_TESTID
what is :P_TESTID
is this an item on your page? try adding the page number of where this item is
such as :P##_TESTID where ## would be your page
for example, :P200_TESTID
hope this helps.

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