# abstract type BaseCustomFieldValue (v202505)

**Service** [CreativeService](https://developers.google.com/ad-manager/api/reference/v202505/CreativeService.BaseCustomFieldValue) **ForecastService** [LineItemService](https://developers.google.com/ad-manager/api/reference/v202505/LineItemService.BaseCustomFieldValue) [OrderService](https://developers.google.com/ad-manager/api/reference/v202505/OrderService.BaseCustomFieldValue) [ProposalLineItemService](https://developers.google.com/ad-manager/api/reference/v202505/ProposalLineItemService.BaseCustomFieldValue) [ProposalService](https://developers.google.com/ad-manager/api/reference/v202505/ProposalService.BaseCustomFieldValue) **Dependencies** [LineItemSummary](https://developers.google.com/ad-manager/api/reference/v202505/ForecastService.LineItemSummary) [ProposalLineItem](https://developers.google.com/ad-manager/api/reference/v202505/ForecastService.ProposalLineItem) ▼ **BaseCustomFieldValue** **Inheritance** **BaseCustomFieldValue** ▼ [CustomFieldValue](https://developers.google.com/ad-manager/api/reference/v202505/ForecastService.CustomFieldValue) [DropDownCustomFieldValue](https://developers.google.com/ad-manager/api/reference/v202505/ForecastService.DropDownCustomFieldValue)

The value of a [CustomField](https://developers.google.com/ad-manager/api/reference/v202505/CustomFieldService.CustomField) for a particular entity.

*** ** * ** ***

Namespace
:
    `https://www.google.com/apis/ads/publisher/v202505`

| ## Field ||
|---|---|
| ### `customFieldId` | ` xsd:long` Id of the `CustomField` to which this value belongs. This attribute is required. |