Hello,
1. I was wrong, the XRechnung is not only B2G but can also be used for B2B as of version 2. Apologies.
2. I was also very late: I only very recently discovered a open source CII/UBL/FatturaPA conversion utility which works in all directions, it is https://github.com/2015-EU-IA-0050/eIgor and apparently already not updated for a longer time. It does runs with Java 1.8, though.
3. Last but not least I would like to invite to four public, free-of-charge, 60min online Q&A sessions RE our Open-source e-invoicing tools Quba-Viewer, Mustang, Mustangserver and Mustang.net on September 4, 5, 6 and 9th of September 15°° CET respectively. Please indicate your availability via https://forms.gle/jpszH8LGZybyccDG7 by Monday, September 2nd.
See you either there and/or at the Entwicklertage
towards the end of the month :-)
-- mit freundlichen Grüßen Jochen Stärk www.usegroup.de Huswertstraße 14 60435 Frankfurt Tel: (069)569940-20 Mobil: (0177)4512645