The input precision in PERIFACT is adjustable between 2 and 4 decimal places, with 4 being the default value.
Internally, it is always calculated with 4 decimal places, and in some places even with 19 decimal places for maximum accuracy. Some users prefer a very precise unit price, especially when the quantity entered increases.
Setting the precision can be done in PERIFACT in main menu SETTINGS - BASIC, [Invoices] tab. Default is 4 decimal places.