Hilary Stoupa:Both of the data sources have multiple rows? "random dates" and "Randomizer"? The XPath I gave you returns true if there are no matches between the lists, and false if there are matches. I'm sorry I'm having such a hard time understanding what you are trying to do here. Can you try to describe it a bit more? Like: One list has values A,B,C,D. The other list has values E,B,D,A. I want to get back "C" from the first list because it doesn't exist in the second list. Or whatever the actual scenario is.
Yes the two data source have multiple rows. Your scenario actually is correct. If the "random dates" have A,B,C,D,E,F,G,H coupon and the "randomizer" have A,B,D,E,F coupon already and the only remaining is C,G and H then the field can either pick C or G or H