Creating a New Version
Each version of an object shows the values of the object's common and unique properties at a point in time. When an object is initially created, the object will be assigned version one. If a class supports data versioning, then when an application calls WriteObject() for an object in the class, MDS will create a new version of the object and assign it a version number that is one greater than the current version. If a class does not support data versioning, WriteObject will use the previous functionality and overwrite the current object.
The new version of an object will retain the previous version's unique property values, except for those that are specifically set in the CMetaObject object. This is the equivalent functionality of no data versioning and is what existing applications would expect.