In my request it appears that I get USD data returned, even though I specifically request EUR in the parameters.
Expected behavior: Get EURO data
Actual behavior: Receive USD data
Example code:
import eikon as ek
ek.set_app_key('<REMOVED FOR PRIVACY>')
screener = 'SCREEN(U(IN(Equity(active,public,primary))), IN(TR.CommonName,"ASML Holding NV"), CURN=EUR)'
timeseries_fields = [  
    "TR.Revenue.date", 
    'TR.F.TotRevenue',
    'TR.F.COGSTot', # Cost of Goods Sold
    'TR.F.SGA', # Selling, General en Administrative
    'TR.F.RnD', # Research & Development expense, part of SGA
    'TR.F.OpExpnTot', # Total operating expense
]
parameters =  {
    # start and end date,
    "SDate": -1,  # is last 20 years
    "EDate": -1,
    "FRQ": "FY", # frequency, full year
    "Curn": "EUR", # currency code, USD/EUR
    "Scale": 6, # in millions
}
df, e = ek.get_data(screener, timeseries_fields, parameters=parameters)
print(df.transpose())