AI-generated Key Takeaways
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CustomFieldValueError.Reason provides reasons for errors related to custom fields and their values.
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Reasons include custom fields or options not being found, custom fields being inactive, and invalid entity types associated with custom field values.
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The UNKNOWN reason is returned when the actual value is not exposed by the requested API version.
 
The reasons for the target error.
- Namespace
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https://www.google.com/apis/ads/publisher/v202508 
| Enumeration | Description | 
|---|---|
                        CUSTOM_FIELD_NOT_FOUND
                      | 
                     An attempt was made to modify or create a CustomFieldValue for a CustomField that does not exist. | 
                        CUSTOM_FIELD_INACTIVE
                      | 
                     An attempt was made to create a new value for a custom field that is inactive. | 
                        CUSTOM_FIELD_OPTION_NOT_FOUND
                      | 
                     An attempt was made to modify or create a CustomFieldValue corresponding to a CustomFieldOption that could not be found. | 
                        INVALID_ENTITY_TYPE
                      | 
                     An attempt was made to modify or create a CustomFieldValue with an association to an entity of the wrong type for its field. | 
                        UNKNOWN
                      | 
                     The value returned if the actual value is not exposed by the requested API version. |