Enum describing possible feed item set link errors.

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

| Enums ||
|---|---|
| ## `FEED_ID_MISMATCH` | The feed IDs of the FeedItemSet and FeedItem do not match. Only FeedItems in a given Feed can be linked to a FeedItemSet in that Feed. |
| ## `NO_MUTATE_ALLOWED_FOR_DYNAMIC_SET` | Cannot add or remove links to a dynamic set. |
| ## `UNKNOWN` | The received error code is not known in this version. |
| ## `UNSPECIFIED` | Enum unspecified. |