select sh.CurrencyRateID, cr.ToCurrencyCode,
       sum(TotalDue) as [cantidad facturada], month(OrderDate) as mes
from sales.SalesOrderHeader sh
     join sales.CurrencyRate cr
         on sh.CurrencyRateID=cr.CurrencyRateID
group by sh.CurrencyRateID, cr.ToCurrencyCode, month(OrderDate)
order by sh.CurrencyRateID asc, 2 desc, 4