File Revisions
When a revision is first created, it is assigned the status DRAFT. When the revision is
ready for general access, it is checked into the vault, and PLM then assigns the status
RELEASED. Releasing a PLM object makes it available for distribution.
When you want to make changes in a released PLM object, you must check it out of the vault. The original revision is then assigned the status UNDER CHANGE, which indicates that another revision is being prepared, and a new revision is created with the status DRAFT.