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5.31. Chapter 7 of the Eurostat Business Register Recommendations Manual stipulates which legal units must be recorded in business registers in European Union member states, while chapter 8 provides relevant information for mode of supply: external sourcing of ancillary services, in section 8.D, and activities of workers under exclusive contracts, in section 8.E, which states that “[t]here are many activities that involve the services of workers under exclusive contracts: commercial representatives, travelling salesmen, insurance agents. Such workers may or may not be treated as employees of the enterprise, depending on the nature of the contract binding them to the enterprise”. Therefore, for countries interested in the self-employed under mode 4, it is advised to take into account the experience of the European Union and to incorporate similar information in their registers to enable compilation of the supply of services by mode 4 persons.