AI-generated Key Takeaways
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AlternativeUnitTypeForecast provides a view of the forecast in terms of an alternative unit type, such as impressions or clicks.
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It includes the number of matched, available, and possible units for the specified unit type.
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Supported unit types include Impressions, Clicks, various CPA conversions, Viewable Impressions, In-target Impressions, and Completed Views.
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The namespace for this service is
https://www.google.com/apis/ads/publisher/v202508. 
A view of the forecast in terms of an alternative unit type.
For example, a forecast for an impressions goal may include this to express the matched, available, and possible viewable impressions.
- Namespace
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https://www.google.com/apis/ads/publisher/v202508 
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                         The alternative unit type being presented. Enumerations 
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                            The number of units, defined by unitType, that match the specified targeting and delivery settings.  | 
                  
                        
                           
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                            The number of units, defined by unitType, that can be booked without affecting the delivery of any reserved line items. Exceeding this value will not cause an overbook, but lower-priority line items may not run.  | 
                  
                        
                           
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                            The maximum number of units, defined by unitType, that could be booked by taking inventory away from lower-priority line items.  |