Presume that an established exchange rate remains constant until the next FO redetermination,
at which time verify the rate again. If at this point, the exchange rate has changed,
presume the change occurred in the month of verification and that it remains constant
until the next redetermination.
EXCEPTION: If the individual reports that the exchange rate has changed, verify the change and
adjust the income charged to reflect the new rate. This includes reports that deal
with a retroactive period (e.g., if the individual reports in December that the rate
changed 2 months ago, verify the change and input it as of October).