Error details returned for BookCampaigns or QuoteCampaigns.

[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 ||
|---|---|
| ## `campaign` | `string` The resource name of the campaign affected by the error, as it was specified in the request. It could contain a temporary ID. Format: customers/{customer_id}/campaigns/{campaign_id} |
| ## `quote_signature` | `string` A signature of the returned quote. The signature covers the entire set of campaigns in the request, and can be used in subsequent requests for the same set of campaigns. |
| ## `quotes[]` | `https://developers.google.com/google-ads/api/reference/rpc/v26/CampaignReservationQuote` A list of proposed quotes for all the campaigns in the request. For the failed campaign, the given quote allows booking. |