How to change Currency Conversion Date in MRC

Dear All,

In R11.5.10 Instance, system is using Multiple Reporting Currencies (MRC) functionality.

Primary functional currency is JPY

1. We created an Invoice and Credit Memo using JPY.

   Invoice:

             Created date: 2015/10/01

             GL date:  2015/10/01

   Credit Memo:

             Created date: 2015/10/07

             GL date:  2015/10/07

  

2. Then applied Invoice in Credit Memo. and view accounting in CM.

     Accounting is displayed in JPY, then click the button 'Alternate Currency' to change to USD accounting.

    

3. Confirmed that 'Currency Conversion Date ' is shown as 2015/10/07.

How can I change 'Currency Conversion Date ' to 2015/10/01 which is Invoice Created date and GL date?

Thanks in advance.

Mindy