A user Creates a Document Change Control with a Document custom Report Type but it does not appear in the Report Type List:
This issue is caused by the related object (Release Change Control) field that has a security override that makes it hidden.
- Set the related object field (Release Change Control) Read Only for the Vault, or for the user.
- Check the Report Type list again. The new custom Report Type should appear.
Vault Help Documentation: N/A