The case concerned a Muslim woman who was told she could not wear a headscarf when she applied to do a six-week work traineeship at a Belgian company.The woman took her grievance to a Belgian court, which subsequently sought advice from the Court of Justice of the European Union (CJEU)."The internal rule of an undertaking prohibiting the visible wearing of religious, philosophical or spiritual signs does not constitute direct discrimination if it is applied to all workers in a general and undifferentiated way," judges said.The CJEU last year said that EU companies could ban employees from wearing a headscarf under certain conditions, if they needed to do so to project an image of neutrality to customers.read moreIn Germany, headscarf bans for women at work have been contentious for years, mostly with regard to aspiring teachers at state schools and trainee judges."