AI-generated Key Takeaways
- 
          The webpage 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 that the actual error reason is not available in 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. |