How forecasting accounts for custom criteria
When you check inventory for a prospective line item that employs customised targeting criteria, keep the following in mind:
You need to add those key values to your ad tags and define them in your network at least seven days (though preferably 28 days) prior to running a forecast.
Regardless of whether the key-value only accepts pre-set values or also accepts free-form values, only those values that have been added 28 days prior to the forecast are fully accounted for when projecting inventory.
For example, if you add a new predefined value (e.g. “chartreuse” in
colour = chartreuse), forecasts fully account for that additional value after 28 days. This is because it needs to be included in the forecasting sample file.