A few points, KVA rated = 0? I believe there is a calculation somewhere in the TLL calculations that takes a square root of (X-Y) if X < Y, then result is a complex number that will return N/A from Arithmetic module. This N/A will propagate until the data recorder.
To troubleshoot with newer version of ION Setup with advanced configuration, this you can start at the Data Recorder module, if you right click the input you can get a popup ("Go to X") to navigate to the module where input is coming from. This will take you to the output of the module in question, from here you can go to the input of the upstream module and repeat until you find the source of the N/A.