| API and mutate method | Current Behavior | New Behavior | 
  | BatchJobService with the Google Ads API | Customers will receive a non-specific error, meaning it may not specify that the issue is related to temporary IDs. | Customers will start receiving failed operations that contain the error: MutateError.MUTATE_ERROR_TEMP_ID_ALREADY_EXISTS | 
  | BatchJobService with the AdWords API | Customers will receive a non-specific error, meaning it may not specify that the issue is related to temporary IDs. | Customers will start receiving failed operations that contain the error: NewEntityCreationError.DUPLICATE_TEMP_IDS | 
  | AdGroupCriterionService or GoogleAdsService.Mutate with the Google Ads API | Customers will not receive an error. | Customers will start receiving the error: MutateError.MUTATE_ERROR_TEMP_ID_ALREADY_EXISTS | 
  | AdGroupCriterionService with the AdWords API | Customers will not receive an error. | Customers will start receiving the error: NewEntityCreationError.DUPLICATE_TEMP_IDS |