Acknowledgements of receipt of the secondment declarations referred to in articles R. 1263-3, R. 1263-4 and R. 1263-6 are appended to the single personnel register and made accessible to the members of the personnel delegation of the social and economic committee and to the officials and agents responsible for ensuring the application of this code and the social security code. They are kept at their disposal either in the establishment, or on each building site or workplace separate from the establishment for those seconded workers employed there.