A worker's true FTE often runs to several decimal places accuracy. Having to round this to only 2 decimal places can produce a significant rounding difference when calculating annual leave allowance for the year.

On a broader note, staff seeing less annual leave allowance than they they expected / are entitled to, forces them to raise a query with their Line manager or HR, and retracts from their sense of job satisfaction.

This is a really important issue to some of our customer, meaning that at the start of every year they need to generate and upload corrections file and put comms out to staff