Rebate process with exchange rate

Hi,

We are using JDE8.12. I have used rebet process to create cradit order. our accounting entrys are in INR and exhange rate is based on invoice date where as rebate % amount is in USD.its foreign SO.

Now i noticed, when we run the sales update and post data to F4078 in USD system picks exchange rate as per R48200 date and not invoice date, It changed the rebate USD amount in order to nullify the exchange rate difference of invocie date and sales update date.

For Exp:

SO amout - 100 USD with 2% rebate and rebate amount is 2 USD with exchange rate 50 ( at invocie date) INR for rebate is  100 INR