77Next, the principle of legal certainty requires that European Union legislation must be certain and its application foreseeable by those subject to it (Case 325/85 Ireland v Commission [1987] ECR 5041, paragraph 18; Case C-63/93 Duff and Others [1996] ECR I-569, paragraph 20; and Belgium and Forum 187 v Commission, paragraph 69). It follows from paragraphs 73 to 75 of the present judgment that the 1997 decision indicated an expiry date, which made it foreseeable for the undertakings likely to avail themselves of the 1997-1999 aid scheme that, after that date, no further invitation to apply for aid could be launched under that scheme.
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