87It should, however, be recalled that the contracting authority must comply with the general principle of EU law relating to sound administration, which carries with it requirements which the Member States must observe when implementing EU law. Among those requirements, the obligation to state reasons for decisions adopted by the national authorities is particularly important, since it puts their addressee in a position to defend its rights and decide in full knowledge of the circumstances whether it is worthwhile to bring an action against those decisions (see, to that effect, judgments of 15 October 1987, Heylens and Others, 222/86, EU:C:1987:442, paragraph 15, and of 7 September 2021, Klaipėdos regiono atliekų tvarkymo centras (C‑927/19, EU:C:2021:700, paragraph 120).
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