**Service** **ForecastService** [LineItemService](https://developers.google.com/ad-manager/api/reference/v202605/LineItemService.ClickTrackingLineItemError.Reason) [LineItemTemplateService](https://developers.google.com/ad-manager/api/reference/v202605/LineItemTemplateService.ClickTrackingLineItemError.Reason) [OrderService](https://developers.google.com/ad-manager/api/reference/v202605/OrderService.ClickTrackingLineItemError.Reason) **Dependencies** [ClickTrackingLineItemError](https://developers.google.com/ad-manager/api/reference/v202605/ForecastService.ClickTrackingLineItemError) ▼ **ClickTrackingLineItemError....**

The reasons for the target error.

*** ** * ** ***

Namespace
:
    `https://www.google.com/apis/ads/publisher/v202605`

| 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](https://developers.google.com/ad-manager/api/reference/v202605/ForecastService.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. |