Make a decision about which UBL version we will use

[agrindst]

We suggest to use UBL versioen 2.3. This is the verdion @PeterLBorresen startet to use when he started working on Transport Excecution Plan Request.

Whenever UBL version 2.4 is released, we should review this again.

• [x] Confirm with Project Group
• [x] Update after confirmation

[DidrikN]

The following decision point was confirmed in the project group meeting February 15th 2023: