7Article 9(1) of Directive 2014/67/EU of the European Parliament and of the Council of 15 May 2014 on the enforcement of Directive 96/71 and amending Regulation (EU) No 1024/2012 on administrative cooperation through the Internal Market Information System (‘the IMI Regulation’) (OJ 2014 L 159, p. 11) provides:‘Member States may only impose administrative requirements and control measures necessary in order to ensure effective monitoring of compliance with the obligations set out in this Directive and Directive [96/71], provided that these are justified and proportionate in accordance with Union law.For these purposes Member States may in particular impose the following measures:[…](b) an obligation to keep or make available and/or retain copies, in paper or electronic form, of the employment contract or an equivalent document within the meaning of Council Directive 91/533/EEC [of 14 October 1991 on the employer’s obligation to inform employees of the conditions applicable to the contract or employment relationship (OJ 1991 L 288, p. 32)], including, where appropriate or relevant, the additional information referred to in Article 4 of that Directive, payslips, time-sheets indicating the beginning, end and duration of the daily working time and proof of payment of wages or copies of equivalent documents during the period of posting in an accessible and clearly identified place in its territory, such as the workplace or the building site, or for mobile workers in the transport sector the operations base or the vehicle with which the service is provided;[…]’
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