“Article 41(1) of the Additional Protocol, signed on 23 November 1970 at Brussels and concluded, approved and confirmed on behalf of the Community by Council Regulation (EEC) No 2760/72 (OJ 1973 C 113 p17), had to be interpreted as meaning that it could be relied on by a Turkish national who, having leave to remain in a member state on condition that he did not engage in any business or profession, nevertheless entered into self-employment in breach of that condition and later applied to the national authorities for further leave to remain on the basis of the business which he had meanwhile established.”
WLR Daily, 21st July 2011
Source: www.iclr.co.uk