Publication lifecycle
Publications can have multiple versions. When a version is released, no additional changes can be made to it or any of its content. Releasing a publication ensures that the output can always be reproduced exactly. Before a publication can be released, all objects within it must be in the Release state.
Once all of the content is released, you can freeze the baseline. This means that you cannot change the content. However, you can change condition settings and output formats. When output formats generate correctly, you can release the publication. After a publication is released, no changes can be made to that version of the publication.
The sequence of steps in the lifecycle of a publication are:
Move the status of all publication components (topics, images, and so on) to Release.
Freeze the baseline.
Adjust condition settings, output formats.
Release the publication.
You cannot make any changes to the frozen version of the publication. To make changes, you must create a new version of the publication.