Impacts of Currency Conversion Option - Costing Exchange rate date type as 'PA Period Ending Date'

Dear All,

Being new in Oracle Apps PA , I would like to know what are the impact areas when Costing Exchange rate date type is set up as 'Expenditure Item Date' OR 'PA Period Ending Date'  and the period is closed. I would like to know what would be the impacts for the project cost from different sources like 'AP Supplier invoice' 'Purchase receipty accrual' or Expense reports.

Your help is highly appreciated.

Many Thnaks in Advance.

Regds,

Abhijit