You are closing the consolidated financial statements on a monthly base.

The currency exchange rate is completed at month end. These rates are being used to translate the foreign currencies transactions to the reporting (consolidated) currency (which is equal to the currency used in the consolidated company), as defined in consolidation translation method being "Closing Rate" and "Historical Rate".

When you need to do a new consolidation in the past, the Average rate is not being maintained in the exchange rate table. So you need to re-enter manually the Average Exchange rate, while doing the consolidation.

The functionality "Select from previous consolidation" does not work, because the Average Rate is missing.