Antwerp-Bruges Port Authority and Port of Rotterdam Authority will make it mandatory to use a bunker measuring system (such as a Mass Flow Meter) on board bunker vessels to measure the exact amount of fuel delivered to sea-going vessels.
Full pressrelease can be found here: https://www.portofrotterdam.com/en/news-and-press-releases/bunker-measuring-system-mandatory-in-antwerp-zeebrugge-and-rotterdam