Universal Business Language Version 2.1
For the full list of release notes, please refer to https://docs.oasis-open.org/ubl/os-UBL-2.1/UBL-2.1.html#A-RELEASE-NOTES.
A.6 Upgrading from UBL 2.0 to UBL 2.1
For current UBL implementers, the most important thing to know about UBL 2.1 is that it is completely backward-compatible with UBL 2.0. In other words, any document that validates against a UBL 2.0 schema will validate against the UBL 2.1 version of that schema. The remaining differences relate mainly to the extended functionality that has been added to the 2.0 business processes in the areas of eTendering, sales reporting, utility statements, transport handling, and collaborative planning, forecasting, and replenishment (CPFR®).
Nonetheless, it would be unwise to simply overlay this UBL 2.1 release onto an existing 2.0 installation, and the possible differences among existing 1.0 and 2.0 installations are too large to allow a specific set of instructions to be provided for making the transition.
The brief history of UBL document types in the next section puts the new capabilities into context and may help users of existing UBL 1.0 and 2.0 implementations decide whether to upgrade to 2.1.
New 2.1 users, on the other hand, can simply install 2.1 and rest assured that their software will interoperate with UBL documents generated by existing conformant UBL 2.0 installations. For more on the concept of conformance, see Section 6, “Conformance" and [Customization].