Exchange rate fluctuation in Project accounting module

Hi All,

While invoicing the hour journal, User invoiced with different date.According to the Hour journal date,they did not post the invoice. Exchange rate value is having different values between the two dates. So, Some variations is displaying in the Voucher transactions and in the report.

Can you please any body give me the advice to solve this exchange rate fluctuation  for Time and material project.

Thanks & Regards,

G. Abila