Default decimal places setting on Sales and Purchases tab were removed. Instead, new Company Preference setting called Decimals Currency is added on the System tab where you can set your Decimal Currency to be used throughout the system (such as the Order, Invoice, PO, Bill, Write Checks, etc).
Decimal Currency is the term used to describe any currency for which the ratio between the basic unit of currency and its sub-unit, which is a power of 10.
Example:
For Sales and Purchasing transactions, money fields (e.g. Sales Price, Cost, Total, Freight, Tax, and etc.) will be rounded to the specified Decimals Currency. If Decimals Currency is set up as 3 digits, a sales price of $326.8295 will be displayed and saved as $326.830.
Reference: Project 1152