AI-generated Key Takeaways
- 
          BaseCustomFieldValuerepresents the value of aCustomFieldfor a specific entity.
- 
          It is used across several services including CreativeService, ForecastService, LineItemService, OrderService, ProposalLineItemService, and ProposalService. 
- 
          BaseCustomFieldValueis the base class forCustomFieldValueandDropDownCustomFieldValue.
- 
          The customFieldIdattribute, which is a required long value, identifies theCustomFieldassociated with this value.
The value of a CustomField for a particular entity.
- Namespace
- 
               https://www.google.com/apis/ads/publisher/v202508
| Field | |
|---|---|
| 
                            | 
                            Id of the  |