In fact, excessively constraining rules of origin have proved problematic for some of the EU’s previous recognition agreements, such as those governing professional-services standards. While a Brazilian orange admitted for sale in Portugal can be sold throughout the EU, a Brazilian engineer or accountant licensed in Portugal must fulfill separate licensing requirements to work elsewhere in the EU, hampering much-needed labor mobility by forcing non-European workers to endure costly and inefficient bureaucratic procedures.
事实上，欧盟此前的不少承认协议（比如在专业服务标准方面）表明，过度约束的来源地规则很有问题大有问题。尽管获准在葡萄牙出售的巴西橙可以在整个欧盟出售，但获得葡萄牙执照的巴西工程师和会计师仍必须满足欧盟其他地区各自的执业要求，这迫使非欧洲工人忍受费时费力的官僚主义流程，不利于急需的劳动力流动。