How can I get a list of all item-sites without a forecast?

Forecast Manager provides the ability to generate this list, so that you know what items do not have a forecast.

1. Load Forecast Manager, and click the Display Options button
2. Set your hierarchy level to the Item-Site level by clicking the "Site" level in the Hierarchy Level box.
3. Set your Hierarchy Node Filtering to "Without Forecast".  This shows only items with zero forecast values from the current period forward, e.g. that have no forecast and you could be at risk.
4. Click "Apply"
5. The resulting list in the Forecast Manager grid is the list of items with no forecast.

You can also learn more in the Forecast Manager Display Options article.