AI-generated Key Takeaways
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BaseCustomFieldValuerepresents the value of aCustomFieldfor a specific entity. - 
          
It is used across several services including CreativeService, ForecastService, LineItemService, OrderService, ProposalLineItemService, and ProposalService.
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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
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https://www.google.com/apis/ads/publisher/v202508 
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                            Id of the   |