**Service** [CompanyService](https://developers.google.com/ad-manager/api/reference/v202605/CompanyService.CustomFieldValueError.Reason) [CreativeService](https://developers.google.com/ad-manager/api/reference/v202605/CreativeService.CustomFieldValueError.Reason) [CreativeSetService](https://developers.google.com/ad-manager/api/reference/v202605/CreativeSetService.CustomFieldValueError.Reason) [ForecastService](https://developers.google.com/ad-manager/api/reference/v202605/ForecastService.CustomFieldValueError.Reason) [LineItemCreativeAssociationService](https://developers.google.com/ad-manager/api/reference/v202605/LineItemCreativeAssociationService.CustomFieldValueError.Reason) [LineItemService](https://developers.google.com/ad-manager/api/reference/v202605/LineItemService.CustomFieldValueError.Reason) [LineItemTemplateService](https://developers.google.com/ad-manager/api/reference/v202605/LineItemTemplateService.CustomFieldValueError.Reason) [OrderService](https://developers.google.com/ad-manager/api/reference/v202605/OrderService.CustomFieldValueError.Reason) **ProposalLineItemService** [ProposalService](https://developers.google.com/ad-manager/api/reference/v202605/ProposalService.CustomFieldValueError.Reason) [UserService](https://developers.google.com/ad-manager/api/reference/v202605/UserService.CustomFieldValueError.Reason) **Dependencies** [CustomFieldValueError](https://developers.google.com/ad-manager/api/reference/v202605/ProposalLineItemService.CustomFieldValueError) ▼ **CustomFieldValueError.Reason**

The reasons for the target error.

*** ** * ** ***

Namespace
:
    `https://www.google.com/apis/ads/publisher/v202605`

| Enumeration | Description |
|---|---|
| `CUSTOM_FIELD_NOT_FOUND` | An attempt was made to modify or create a [CustomFieldValue](https://developers.google.com/ad-manager/api/reference/v202605/ProposalLineItemService.CustomFieldValue) for a [CustomField](https://developers.google.com/ad-manager/api/reference/v202605/CustomFieldService.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](https://developers.google.com/ad-manager/api/reference/v202605/ProposalLineItemService.CustomFieldValue) corresponding to a [CustomFieldOption](https://developers.google.com/ad-manager/api/reference/v202605/CustomFieldService.CustomFieldOption) that could not be found. |
| `INVALID_ENTITY_TYPE` | An attempt was made to modify or create a [CustomFieldValue](https://developers.google.com/ad-manager/api/reference/v202605/ProposalLineItemService.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. |