To generally be honest I believe we must be going to Intercontinental recognized norms for forex reporting, particularly ISO 4217. In this case, 1 would use USD. In Europe they've clearly described requirements for reporting forex in paperwork. In this instance they use the ISO 4217 code of EUR, see https://caidenqvyaa.elbloglibre.com/36586819/new-step-by-step-map-for-100-cash