Incorrect Exchange Rate used in PO Receipt

Hi,

Can anyone help me on this? I am using RMS 14.  Here are my steps.

1) I created a PO using a currency (ARS - Argentina Peso) different from base currency (USD).

2) I override the exchange rate in the RMS Order Header screen with my own rate e.g. 3

3) I added my expenses and approved the PO

4) I shipped and received the PO using RMS Screens

5) When I checked tran data for tran code 20 of my PO, the total cost was in the PO currency which is correct because location currency is in ARS as well.  But the exchange rate it used was the system exchange rate instead of the exchange rate I used in the RMS Order Header screen which is 3.