Value calculation with time limitations 
The following example shows how values are calculated if lessons are datelimited. Please look at lesson number 25 in the Demo2.gpn file. The factors in the master data should not be taken into consideration and lessons should take place between 18 November and 28 February.
In these circumstances a value of 1.395 results. Looking at the school year calendar you can recognise how this value was calculated.
The school year extends over a period of 43 weeks (including holidays). However, there are only 15 weeks available for lessons. Dividing one value by the other (total weeks / lesson weeks) gives a distribution time factor that is used to multiply the value of the lesson.
The following calculation is performed: 4 * 15 / 43 = 1.395
School days only
As already mentioned, this calculation included weeks with school holidays. If you wish to exclude this you can also activate the 'Count only school days' option on the 'Value calculation' tab under 'Start  Settings  Miscellaneous'.
Doing this means that only those weeks are included in the calculation in which lessons occur on at least one day.
If the 'Count only school days' option is activated, the value in this example will change from 1.395 to 1.200.
The 'Values for count only schooldays' tab in the calendar for the school year explains the changed value. Deducting the school holidays from the school year leaves 40 weeks. There are 12 weeks available for lesson number 25. These two values are again divided, resulting in a distribution time factor of 12 / 400 = 0.300 If this time factor is now multiplied with the number of weekly periods for lesson 25 the result is 1.200.
