Exposing date base price last changed

Hello there, this is a general question, i've built a report that shows the date an item defined cost has last changed, this was relatively simple, see criteria and columns below, but need a similar search to pull the date a base price was last changed, and from what i can see this is not selectable in the same way as item defined cost, have looked on Suite Answers but no joy, by all accounts it isn't exposed and therefore can't be used as either criteria as below or in a formula. The only solution suggested is to create a