AI-generated Key Takeaways
- 
          
The content lists various Ad Manager API services with links to their
RequiredCollectionError.Reasondocumentation. - 
          
The
RequiredCollectionError.Reasonenumeration defines reasons for errors related to required collections, including missing, too large, or too small collections. - 
          
The
UNKNOWNvalue indicates a reason not exposed by the requested API version. 
- Namespace
 - 
               
https://www.google.com/apis/ads/publisher/v202508 
| Enumeration | Description | 
|---|---|
                        REQUIRED
                      | 
                     A required collection is missing. | 
                        TOO_LARGE
                      | 
                     Collection size is too large. | 
                        TOO_SMALL
                      | 
                     Collection size is too small. | 
                        UNKNOWN
                      | 
                     The value returned if the actual value is not exposed by the requested API version. |