Japanese Finance Minister Sadakazu Tanigaki said on Wednesday that foreign exchange rates should move in line with fundamentals, and if not authorities would act as needed. "It is desirable for exchange rates to reflect fundamentals. When that is not the case we will do what we have to do," he told reporters. Earlier on Wednesday the yen breached 104 yen to the dollar for the first time since June 2000, helped by optimism about the Japanese economy and speculation the government has scaled back the huge interventions it was conducting in the currency market to curb its strength.////