Article 52 1.

exchange with or make available to institutions of other Member States the elements for identifying persons who change from one applicable national legislation to another, and together ensure that those identification elements are retained and correspond, or, failing that, provide those persons with the means to access their identification elements directly;

sufficiently in advance of the minimum age for commencing pension rights or before an age to be determined by national legislation, exchange with or make available to the person concerned and to institutions of other Member States information (periods completed or other important elements) on the pension entitlements of persons who have changed from one applicable legislation to another or, failing that, inform those persons of, or provide them with, the means of familiarising themselves with their prospective benefit entitlement.