123In that regard, it must be recalled that the principle of legal certainty, which is a general principle of EU law, requires that EU law must be clear and its application foreseeable for all interested parties. That principle requires that the binding nature of any act intended to produce legal effects must be derived from a provision of EU law which must be expressly indicated as its legal basis and which prescribes the legal form to be taken by that act (see judgments of 12 December 2007 in Italy v Commission, T‑308/05, ECR, EU:T:2007:382, paragraph 123 and the case-law cited, and 29 September 2011 Poland v Commission, T‑4/06, EU:T:2011:546, paragraph 82 and the case-law cited).