If the forecast is empty for your line item, it indicates that the combination of your selected targeting criteria and deals results in zero frames available for the specified line item.
There are several reasons why the forecast could be empty:
1. The targeting criteria you selected for your line item might be too restrictive, resulting in a non-existent pool of available inventory.
2. You will not get any forecast if you are targeting more than 32,000 frames.
3. The combination of deals and publishers chosen for the line item might not have any overlapping inventory, leading to an empty forecast or empty deal selection.
4. The selected deals for the line item may have become inactive, meaning they are no longer available for use in the forecast.