I am trying to categorize/match a banking item (customer payment made in GBP) with customer invoice in EUR.

In order to do this, I need to adjust the currency rate, however the system only authorize 6 decimals for the currency rate, which is not enough to obtain the right figure. 

Example:

Invoice of 40,000.00EUR

Payment of 27,918.74GBP

I need the currency rate to be 0.6979685 to obtain 27,918.74 GBP.

However with the way the system works, I can only enter 0.697968, which gives me 27918.72 GBP, and Zoho will not match it since it is not exactly the same amount.

Would it be possible to fix this?

Thank you.