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is there a way to construct a "NotARefnum" constant just like a string or number?. I have a case structure with a VI Refnum Output. The other case should be filled with a NotARefnum constant, but going to the Refnum output terminal and clicking the pop-up menu doesn't give me the desired "create constant" or "create not a refnum" block. Is there a specific VI, that represents a NotARefnum, if yes:Where is it ? If no:How to solve my problem?