Expense amount rounding off

Hi Friends,

When I enter any expense amount in PR05 with decimals, the system rounds it off. Like if I enter the amount as 20.80, it will be converted as 21.00 on the main PR05 screen (showing the list of trips) and same amount is transferred to FI. The screen where I enter the amount, still shows 20.80. Could you please guide me where to change the setting to avoid rounding off.

Thanks!