The metadata associated with a plannable user list.

[Proto definition ![GitHub](https://developers.google.com/site-assets/logo-github.svg)](https://github.com/googleapis/googleapis/blob/master/google/ads/googleads/v26/services/reach_plan_service.proto)

| Fields ||
|---|---|
| ## `user_list_crm_data_source_type` | `https://developers.google.com/google-ads/api/reference/rpc/v26/UserListCrmDataSourceTypeEnum.UserListCrmDataSourceType` The data source type of a CRM based user list. |