AI-generated Key Takeaways
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ContendingLineItem describes line items that compete for the same impressions in a forecast.
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The
lineItemIdfield identifies the competing line item. - 
          
The
contendingImpressionsfield indicates how many impressions are contended for and served by the competing line item in the forecast simulation. 
Describes contending line items for a Forecast.
- Namespace
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https://www.google.com/apis/ads/publisher/v202411 
                        Field | 
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                            The Id of the contending line item.  | 
                  
                        
                           
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                            Number of impressions contended for by both the forecasted line item and this line item, but served to this line item in the forecast simulation.  |