AP invoice amount - how many decimals can OIC accept in AP invoice import

AP invoice amount - how many decimals can OIC accept in AP invoice import . Is there a restriction on how many decimal places amount can go.

Business is concerned on rounding errors which over a period form lot of amount.

How many places of decimals can OIC import for example if invoice amount is 100.33333333333 will it be imported as is or 100.33, or 100.333 or 100.33333.

Please note i am not asking on the precision of currency and the field shown on front end.