Specialized Administration > Working with Properties and Command Line Utilities > Single-Level View Version Conversion Command Line Utility > Multi-Level Revision Labels
  
Multi-Level Revision Labels
Prior to Windchill 10.0, the default versioning scheme for all objects is set in the Site context and is a simple alphabetical scheme. Version identifiers are first assigned as a single letter. After all letters from A through Z have been assigned, the following sequences are used:
AA– ZZ
AA, AB, AC, ..., AZ
BA, BB, BC , ..., BZ
(and so on)
AAA– ZZZ
AAB , AAC , ..., AAZ
BAA, BAB , BAC , ..., BAZ
(and so on)
When a new view version of a part is created, a second identifier is added, using a period as a delimiter. In subsequent revisions, the latest identifier is incremented according to the standard alphabetical versioning scheme. For example:
A new view version of version B is assigned the identifier B.A
A revision of B.A is assigned the identifier B.B
A revision of Z.Z is assigned the identifier Z.AA
* 
The document templates that are loaded into the site context during installation use the out-of-the-box versioning scheme.