Using a 'Not Null' in Cognos Impromptu

Gurus, I am trying to use "Not Null" in a filter expression in Impromptu but I don't find it in the function set. Can you tell me what should I do !
Flex TronDeveloperAsked:
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Flex TronDeveloperAuthor Commented:
I m trying to use "Null' like (pos is null) in oracle sql but can't reconstrruct in impromptu.

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Jinesh KamdarCommented:
Thx for the accept, but I didn't understand why the 'B' grade !!!
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