Is there any way we can check the availability for some TR formulas? Let's say for something like TR.FundType. Is there a way to track the availability of that and other factors throughout history within Eikon?

For example, if I request TR.PriceClose or returns I'm sure I'll get an almost entirely populated data request (specially if the RICs used are not delisted). But this availability varies between factors (one example might be TR.FundType), and that's a metric I'd like to monitor if Eikon provides a tool for it of course.

I'm not sure if my question is understandable, but if it is, any advice I could get is valuable.

Thanks in advance!