Changing periodicity

If school holidays interrupt the periodicity, causing the same type of lessons to be held in consecutive weeks - as this would be the case in February - the periodicity can be modified under 'Settings | School holidays'.

Simply enter the name of the week that should follow the school holidays in the 'Next week (A,B...)' column. In the example 13 February will start with week A although according to the periodicity it should be the turn of week B.