AI-generated Key Takeaways
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          The document provides a list of various Ad Manager API services, including links to their CommonError.Reason documentation. 
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          It specifically details the CommonError.Reason enumeration, which describes reasons for common errors encountered when using these services. 
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          The CommonError.Reasonenumeration includes values such asNOT_FOUND,ALREADY_EXISTS,NOT_APPLICABLE,DUPLICATE_OBJECT,CANNOT_UPDATE,UNSUPPORTED_OPERATION,CONCURRENT_MODIFICATION, andUNKNOWN.
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          Each enumeration value in CommonError.Reason has a description explaining the specific error condition it represents. 
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          The CommonError.Reason enumeration is part of the https://www.google.com/apis/ads/publisher/v202411namespace.
Describes reasons for common errors
- Namespace
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               https://www.google.com/apis/ads/publisher/v202411
| Enumeration | Description | 
|---|---|
| NOT_FOUND | Indicates that an attempt was made to retrieve an entity that does not exist. | 
| ALREADY_EXISTS | Indicates that an attempt was made to create an entity that already exists. | 
| NOT_APPLICABLE | Indicates that a value is not applicable for given use case. | 
| DUPLICATE_OBJECT | Indicates that two elements in the collection were identical. | 
| CANNOT_UPDATE | Indicates that an attempt was made to change an immutable field. | 
| UNSUPPORTED_OPERATION | Indicates that the requested operation is not supported. | 
| CONCURRENT_MODIFICATION | Indicates that another request attempted to update the same data in the same network at about the same time. Please wait and try the request again. | 
| UNKNOWN | The value returned if the actual value is not exposed by the requested API version. |