Error returned as part of a mutate response. This error indicates single policy violation by some text in one of the fields.

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

| Fields ||
|---|---|
| ## `external_policy_description` | `string` Human readable description of policy violation. |
| ## `external_policy_name` | `string` Human readable name of the policy. |
| ## `is_exemptible` | `bool` Whether user can file an exemption request for this violation. |
| ## `key` | `https://developers.google.com/google-ads/api/reference/rpc/v26/PolicyViolationKey` Unique identifier for this violation. If policy is exemptible, this key may be used to request exemption. |