Note: There is a newer version of this specification see VEC 2.0.2
OpenEnumeration that defines the nature of a PartVersion. The nature specifies how the PartVersion can be used in the different processes or the significance of the PartVersion in the process.
Preliminary PartVersion represent part numbers which are used as place holders for parts that are not yet developed, or which are representing prototype parts that are not allowed in serial production.
Productive PartVersions represent regular part numbers that are used in serial production.
CustomerOrder PartVersions represent part numbers that are not regularly used in serial production. They are only used to fulfil special customer orders (e.g. an adapter connector for equipment of a special purpose vehicle).