Enum describing possible ad group bid modifier errors.

[Proto definition ![GitHub](https://developers.google.com/site-assets/logo-github.svg)](https://github.com/googleapis/googleapis/blob/master/google/ads/googleads/v25/errors/ad_group_bid_modifier_error.proto)

| Enums ||
|---|---|
| ## `CANNOT_OVERRIDE_OPTED_OUT_CAMPAIGN_CRITERION_BID_MODIFIER` | Cannot override the bid modifier for the given criterion ID if the parent campaign is opted out of the same criterion. |
| ## `CRITERION_ID_NOT_SUPPORTED` | The criterion ID does not support bid modification. |
| ## `UNKNOWN` | The received error code is not known in this version. |
| ## `UNSPECIFIED` | Enum unspecified. |