I played around with this Peppol Validator (https://ecosio.com/en/peppol-and-xml-document-validator/, which uses https://github.com/phax/phive) and found out that the tax category for reverse charge in the CRONUS DK may not be correct.

In my option the tax category should be AE (https://docs.peppol.eu/poacc/billing/3.0/2023-Q4/codelist/UNCL5305/). If so, this applies also to other EU CRONUS Databases like DE.

Yammer Discussion: https://www.yammer.com/dynamicsnavdev/#/Threads/show?threadId=2711271553204224