Version
A version is an image of a model that represents the unique state of the model at the time it was versioned in a change list.
A version represents a modification of a model and, for example, in Release Cycle Management, you can determine which version is valid from which point in time. Therefore, versions cannot be modified.
The editable state of a model is workspace, the last version created is the current version, and the other versions are associated with the Change list numbers (Versioning state).