Most problems with holiday calculations are caused by bad attendance locking. Either the attendance for the past months is not locked at all, or it is locked in the wrong order. We have newly added a warning about bad attendance locking, which will be displayed as an exclamation point for the given user both in the Attendance agenda and in the Personnel agenda on the 5) Attendance tab. After clicking, you will also learn in which months the problem was found, so there is no need to check the data manually.