While Hong Kong legal service providers in the mainland are still barred from engaging in any business related to practising mainland law, as are other foreign law firms and practitioners, Supplement X of CEPA, which came into effect in 2014, introduced a pilot measure in Guangdong which allows mainland practising lawyers to be seconded to mainland representative offices of Hong Kong law firms set up this Province. This is regarded as a ground-breaking provision, as it allows seconded lawyers to act as consultants on mainland law. This commitment was essentially reiterated under the Guangdong Agreement, which became effective in March 2015.