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By default, local modifiers are committed when the user starts a server run in which these modifiers are used. When this option is enabled the modifiers will be committed directly after the moment they are changed.
Valid time
The behaviour of the valid time for simulated time series and external historical time series is as follows:
When modifiers are defined in the period before valid time, they will always be valid.
The situation changes when modified values are placed in the future. When the valid time is on or after time zero, all modified values are valid and will be used.
Later, when time has proceeded and valid time is before time zero, the modified values AFTER valid time are not valid anymore.
The behaviour of the valid time for external forecasting time series is as follows:
If a modifier has a valid time then it will only be applied if the external forecast time is the same as the valid time. If a modifier doesn't have a valid time then it will always be valid.
Assigning modifiers to whatifs
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