AI-generated Key Takeaways
- 
          
ChangeHistoryOperation describes an operation performed on an entity.
 - 
          
Possible ChangeHistoryOperation values include CREATE, UPDATE, DELETE, and UNKNOWN.
 - 
          
UNKNOWN is returned if the actual value is not exposed by the API version.
 
                  Service
               
               
                  PublisherQueryLanguageService
               
            
                  Dependencies
               
               
                  ChangeHistoryValue
                  
            ▼
                  ChangeHistoryOperation
               An operation that was performed on an entity.
- Namespace
 - 
               
https://www.google.com/apis/ads/publisher/v202505 
| Enumeration | Description | 
|---|---|
                        CREATE
                      | 
                     |
                        UPDATE
                      | 
                     |
                        DELETE
                      | 
                     |
                        UNKNOWN
                      | 
                     The value returned if the actual value is not exposed by the requested API version. |