**Service** [ProposalLineItemService](https://developers.google.com/ad-manager/api/reference/v202605/ProposalLineItemService.ProposalActionError.Reason) **ProposalService** **Dependencies** [ProposalActionError](https://developers.google.com/ad-manager/api/reference/v202605/ProposalService.ProposalActionError) ▼ **ProposalActionError.Reason**

The reasons for the target error.

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

| Enumeration | Description |
|---|---|
| `NOT_APPLICABLE` | The operation is not applicable to the current state. |
| `IS_ARCHIVED` | The operation cannot be applied because the proposal is archived. |
| `UNKNOWN` | The value returned if the actual value is not exposed by the requested API version. |