How have period rates changed between release 11 and release 12?
From R12 onwards, period rates are no longer stored separately in Oracle E-Business Suite. Instead, daily rates are used for revaluation and translation.
When you set up your Ledgers in R12, you specify which rate type should be used for period end and period average rates. You can often use your transactions daily rate type for period end. However, Oracle does not calculate the period average rate for you, so you will need a separate rate type to hold these.
FXLoader offers the ability to calculate this average for you and store it in a separate rate type in R12.