BAQ - Blank Date field records

I tried creating a BAQ against the InvcHead.DueDate = Blank but the criteria does not like the specified constant of “” or DueDate IsNull. How do you bring in only Blank date field records?

There is a thread around about all of the ways that does not work, but I think there was one that did depending on the version.

I tried in 10.2.400 and it did not work. What was the one that did work?

This should work I guess
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Somehow when I tried the ISNULL on date fields, it is giving a syntax error.