AI-generated Key Takeaways
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          AlternativeUnitTypeForecast provides a view of the forecast in terms of an alternative unit type, such as viewable impressions for an impressions goal. 
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          The unitTypefield specifies the alternative unit type being presented, which can be impressions, clicks, various CPA conversions, viewable impressions, or in-target impressions.
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          matchedUnitsindicates the number of units that match the specified targeting and delivery settings for the alternative unit type.
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          availableUnitsshows the number of units that can be booked without affecting reserved line items.
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          possibleUnitsrepresents the maximum number of units that could be booked by taking inventory from lower-priority line items.
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/v202505
| Field | |
|---|---|
| 
                            | The alternative unit type being presented. Enumerations 
 | 
| 
                            | 
                            The number of units, defined by unitType, that match the specified targeting and delivery settings. | 
| 
                            | 
                            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. | 
| 
                            | 
                            The maximum number of units, defined by unitType, that could be booked by taking inventory away from lower-priority line items. |