Hi Martin,
Yes, It is very much possible. You can define Currency Translation type in BW.
T Code: RSCUR, where you have to provide currency translation details like
Exchange rate type: Exchange rate type is the key under which you define exchange rates in the system.
Source currency: The currency that you wish to convert into a different one.
Target currency: The currency that is available after currency translation.
Time reference: Time reference for the currency translation can be either fixed or variable.
While setting this chose option: Target currency from variable and enter variable name which has been created based on currency char (e.g. on 0CURRENCY), make sure that this variable in optional.
use, Currency translation type and 0CURRENCY varialbe on BW report to get desired result.
For step by step guide refer: http://www.sdn.sap.com/irj/scn/go/portal/prtroot/docs/library/uuid/a0d5bf96-b19b-2c10-e3b6-e2f12a3de99a?quicklink=index&overridelayout=true
Regards,
Avinash