Enum describing possible errors from ReachPlanService.

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

| Enums ||
|---|---|
| ## `NOT_FORECASTABLE_ACCOUNT_NOT_ENABLED` | Not forecastable due to account not being enabled. |
| ## `NOT_FORECASTABLE_MISSING_RATE` | Not forecastable due to missing rate card data. |
| ## `NOT_FORECASTABLE_NOT_ENOUGH_INVENTORY` | Not forecastable due to not enough inventory. |
| ## `UNKNOWN` | The received error code is not known in this version. |
| ## `UNSPECIFIED` | Enum unspecified. |