what is the impact on adding decimal places in CUNI

Dear SAP Guru's

Currently our client is running SAP for last 7 years now we got requirement to change the decimal places in CUNI to 3 . Can you please let me know is there any impact on the same to finanace and any other module. I reffered SAP note 931971 & talked to some of people all are suggesting not to change this setting as this is global one and it may impact some where. So please help me if we can change the decimal places to 3 or not.

Regards

Mahesh M J