Campaigns that use the same inventory
If other campaigns using the same inventory are hindering completion, or if your forecasted campaign impacts other campaigns, a list will appear under the forecast:
By default, the list is sorted by campaign level:
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The campaign for which the forecast is being made is highlighted with a marker and is outlined in bold (in the example, it is the third in the list).
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The higher-level campaigns are located above the campaign for which the forecast is being made. In the Rotation column, their level and priority are indicated, and in the Taking over column, the number of impressions that these campaigns take away from the current campaign is indicated.
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The lower-level campaigns are located under the campaign for which the forecast is being made. In the Wasting column, the number of impressions that these campaigns lose due to the current campaign is indicated.
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Campaigns of the same level are located next to the campaign for which the forecast is being made: they can be either higher or lower in the list. These campaigns can either take away impressions or give them away in favor of the forecasted campaign.
Note
If no campaign list appears, it means the forecasted campaign doesn't overlap with other campaigns on the specified placements.
If the campaign forecast suggests that it may not be completed, you can model how stopping other campaigns using the same inventory would affect its completion. To do this, exclude another campaign from the forecast by clearing the 
checkbox in the corresponding line and clicking Update. The forecast will be updated, and the line with the excluded campaign will turn gray (meaning it isn't included in the forecast).
To add the campaign back, select the appropriate checkbox and click Update again.
For recommendations on what to do if your campaign might not be completed, see Forecast analysis.