Currently if an employee has a planned absence at any point in the future, you cannot add sickness with an open ended date, meaning its impossible to accurately monitor sickness when almost 50% of staff have planned absences at some point in the future. I agree with removing the ability to not be able to add multiple instannces of the same absence type but there should be the option to have sickness and other types such as holiday (which can be taken whilst on sick leave)