When I try to pull New Value or Old Value into Rule dataset filters, it gives me an error:

Why?

I can get around it by creating a Transformation Case Expression field then filtering the custom field… but that’s kind of a pain. 

While we’re at it, I noticed that LongText fields cannot be used in the dataset filters either.  But they CAN be used in the Action filters.  

Would be good to be able to pull these field types into filters directly.