Bank Transfer Screen - Prevent Rate Date Auto Change in Pop Up Screen

Hi all,

I had some technical issue that need to seek help. May I know is there any way to prevent Rate Date in pop up screen as below to auto change when we manually key in Exchange Rate and manually key in amount (Transfer Amount, Deposit Amount)?

Select Currency Rates (1.5500000) from finder and Rate Date become 30/12/2020.

Manually change Exchange Rate from 1.5500000 to 2.0000000, Rate date will auto change to 15/01/2021, how to prevent it to change? I need Rate Date still remain in 30/12/2020.

Your assistance herein is greatly appreciated.