The official European Union website (https://joinup.ec.europa.eu/news/public-money-public-code) mentions LibreOffice as the only option explicitly.
> From: Jörg Schmidt [mailto:joe...@j-m-schmidt.de] > Sent: Friday, January 19, 2018 12:28 PM > To: dev@openoffice.apache.org > Subject: Re: OpenOffice in the future in the public > administration of Barcelona(?) > Interesting, but imho currently only a statement of > https://www.theinquirer.net/ - not a statement of the city of Barcelona. > In addition, _the experience of the LiMux project includes both OO and LO_, > and > the experts who provide professional support for migrations usually support > both programs in the same way. > Jörg