currency conversion - translation rates

Hi,

The amount shall be converted from currency "GBP" to "AUD".

Therefore we have maintained:

- an exchange rate type (which contains "EUR" as the reference currency)

- the translation ratios for the combinations GBP-EUR, EUR-GBP, AUD-EUR, EUR-AUD

- the rates: GBP->EUR, EUR->AUD

Afterwards we used the function module "CONVERT_TO_LOCAL_CURRENCY";

however the result was returncode 3 - meaning "NO_FACTORS_FOUND"

However,if we maintain the translation ratio GBP-AUD,it works.

For me this seems to be not really logic:

The "cross rates" are determined in table tcurr but the "cross ratios" are not.

Is this true or what is/might be the error?

Thanks for your help, Kora