I’ve just run into a bizarre problem. The result of a Boolean calculation in Data Viewer is different from the result of the same calculation in my Layout.

Here is the calculation:

IsEmpty (Address::Street)

I place the calculation in Data Viewer and in a Field on my Layout.

IN DATA VIEWER, this calculation evaluates “True” when the field contains no data, and it evaluates “False” when the field contains data.

IN THE LAYOUT, this calculation always evaluates “True”, whether or not there is data in the field!

I get the same results when I use IsValid().

Is there something obvious I’m missing here?

Is your calculation field unstored?

Yes, indeed, it's unstored, but... your question prompted me to click on the "Do not store results" checkbox. (I don't know, just to be sure.) When I did that I got the message, "This calculation cannot be stored, because..." That led me to look at the "Evaluate this calculation from the context of..." That's where the problem lay. Wrong context. Thanks for the brain jumpstart!