16Accordingly, it is for the national legal system of each Member State, by virtue of the principle of its procedural autonomy, to make such a determination and to lay down the detailed procedural rules governing actions for safeguarding rights which individuals derive from EU law. Nonetheless, it is clear from the settled case-law of the Court that the application of national law must not undermine the application and effectiveness of EU law and that that would be the case, in particular, if such an application made it impossible in practice to recover the sums improperly granted. National legislation must also be applied in a manner which is not discriminatory as compared to procedures for deciding similar national disputes and the national authorities must act with the same degree of care, and in accordance with rules and procedures which do not make the recovery of the sums in question more difficult, as in comparable cases concerning solely the application of corresponding national legislation (see, to that effect, judgment of 13 March 2008, Vereniging Nationaal Overlegorgaan Sociale Werkvoorziening and Others, C‑383/06 to C‑385/06, EU:C:2008:165, paragraphs 48 and 50 and the case-law cited).
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