question: Why was the Dutch lawyer who moved to Belgium while advising a client in a social society case told he couldn't continue?
sentence: For example, in Van Binsbergen v Bestuur van de Bedrijfvereniging voor de Metaalnijverheid a Dutch lawyer moved to Belgium while advising a client in a social security case, and was told he could not continue because Dutch law said only people established in the Netherlands could give legal advice.