History years are very easy to use in the company models
when you remember the colour
codes:
In the beginning you are allowed to change
blue figures. The black ones are calculated
by the model.
When you change blue
figures, they become red
which you are also allowed to change.
(If you would like to reset
red colours back
to blue, click first Tracking off and
then Tracking on.)
The minimum requirement of the model for history years
is to fill at least the last actualised year. The years
before that are in practise only for easier estimating
and statistical use.
Notice that usually you do not need to change history
years at all. The most obvious reason for doing it, is
when you start to fill an empty model.
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