CIN High Error

I'm using a CIN input to monitor a 4-20 mA signal. I have the Calibration set to {4000; 15000; 0; 137.5} Per the manual, the Error Value should result at the 'Illegal Value' point. For a Low Error, this occurs at 2 mA as expected. I assumed the Max input value to be 20 mA, and my Max value is set to 15 mA. The halfway point between them is 17.5 mA. For some reason the High Error condition is not happening. Am I using the wrong signal max value of 20 mA? If so, what should that value be?

In contrast, the Low and High Error points for a VIN are working exactly as expected when using a Vin Max of 5 Vdc.

I've found this to be true for both IQANsimulate and the actual hardware.

I'm using an MC43FS and IQANdesign 7.06.22.11482.