AI-generated Key Takeaways
- 
          ForecastService, LineItemService, LineItemTemplateService, and OrderService are services that may encounter a ClickTrackingLineItemError. 
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          The ClickTrackingLineItemError enumeration provides specific reasons for errors related to click tracking line items. 
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          Common reasons for ClickTrackingLineItemError include immutable line item type, invalid targeting or roadblock type, unsupported creative rotation or delivery rate types, and unsupported fields. 
The reasons for the target error.
- Namespace
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               https://www.google.com/apis/ads/publisher/v202508
| Enumeration | Description | 
|---|---|
| TYPE_IMMUTABLE | The line item type cannot be changed once created. | 
| INVALID_TARGETING_TYPE | Click tracking line items can only be targeted at ad unit inventory, all other types are invalid, as well as placements. | 
| INVALID_ROADBLOCKING_TYPE | Click tracking line items do not allow us to control creative delivery so are by nature one or more as entered by the third party. | 
| INVALID_CREATIVEROTATION_TYPE | Click tracking line items do not support the CreativeRotationType.OPTIMIZED creative rotation type. | 
| INVALID_DELIVERY_RATE_TYPE | Click tracking line items do not allow us to control line item delivery so we can not control the rate at which they are served. | 
| UNSUPPORTED_FIELD | Not all fields are supported by the click tracking line items. | 
| UNKNOWN | The value returned if the actual value is not exposed by the requested API version. |