In a judgment delivered on Wednesday 11 July in Case C-356/15, the European Court of Justice held that Belgian law infringes European Union law governing the posting of workers.
A1 certificates (formerly E101) are documents issued to workers to indicate that in the event of posting they continue to be subject to the social security scheme of their country of origin.
Belgian law stipulates that when it is considered that an A1 certificate has been incorrectly issued in another member state,...