serious infringement
as defined in Regulation (EU) No 1380/2013 of the European Parliament and of the Council of…, Article 4(1), point (31) (Definitions)
an infringement that is defined as such in relevant Union law, including in Article 42(1) of Council Regulation (EC) No 1005/2008 and in Article 90(1) of Regulation (EC) No 1224/2009;