ECHA has updated the list of substances that might be chosen for compliance checks. There are 60 new substances. Registrants of these substances are strongly advised to update their registration dossiers including the chemical safety report and tonnage band by 28 April 2017. By updating your dossier, you are making sure that ECHA checks the most up-to-date information.
ECHA has published this list since January 2015. This gives registrants the chance to update their dossiers before the compliance check starts. However, the list is indicative and non-exhaustive: ECHA can check the compliance of any dossier at any time and without prior notice.