When invitbox creates a map, we set as a default the national currency of the supplier. So if it is an Australian supplier, the map will be created in AUD.
But that supplier may not bill you in Aussie dollars...? Not to worry.
You actually set the currency in invitbox when you first choose the map you want to use.
From the Unknowns tab, when you find map > try map > use map you are then asked to either assign that map to an existing supplier (from the drop down) or add a new supplier. As part of the process of adding a new supplier you set the default GL codes, categories etc etc. As part of that process you set the default currency that the supplier bills you in - see below.
From that moment forward invitbox will always assume that if that map is used to extract data from a bill, that you are being billed in that currency. You can of course change the currency on a bill by bill basis by changing it in panel 3 of the Intray or Approved tab, or you can change the default currency at any time via Admin > Suppliers > edit.