There is a global setting which restricts content types which may be inserted into a book.

Please make (among the global setting) per book settings for which content types can be inserted into a particular book.

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Version: 7.22 » 7.x-dev

Core issues are now filed against the dev versions where changes will be made. Document the specific release you are using in your issue comment. More information about choosing a version.

Status: Active » Closed (outdated)

Automatically closed because Drupal 7 security and bugfix support has ended as of 5 January 2025. If the issue verifiably applies to later versions, please reopen with details and update the version.