Hi Eric,
It seems like the parameter mapping usually done when the "Invoke object query" "findByParameter" method is call on the MBO doesn't work for some reason.
I didnt find anything wrong in steps mentioned by you until you dont see anything in parameter mappings.
I suggest you to recreate the same project again from starting. Please follow the test data given in this document.
provider: AVERAGE
source currency: ARS
Target Currency: USD
Rgrds,
Jitendra