James,
Since the IIF statements will always evaluate to something (value or null), its impossible not to have a criterion in one of the fields. So, I suggest that you make two queries, one for each criteria option. Then whenever the query is invoked (I'm assuming on an event of the form)...
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.