As far as I know, you can not audit an abstract object, there are 4 abstract objects : investment, financials, Financial Properties and Project Financial Properties.
For ex, Location is under Financial properties object. there is no out of box way to audit them, but you can follow this post for a custom way, i am unsure if this will be supported by CA though. How do you audit the resource class field in the financial section of the
Hope this helps.JayaSantoshKumar