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

The reasons for the target error.

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

| Enumeration | Description |
|---|---|
| `INVALID_ACTIVITY_FOR_ADVERTISER` | When associating an activity to a line item the activity must belong to the same advertiser as the line item. |
| `INVALID_COST_TYPE_FOR_ASSOCIATION` | Activities can only be associated with line items of `CostType.CPA`. |
| `UNKNOWN` | The value returned if the actual value is not exposed by the requested API version. |