20Second, in order for an act to confirm a previous measure, the initial and subsequent acts must have a common purpose (see, in particular, the judgment in Case 58/69EVL v Commission [1970] ECR 507). In the present case, the letter of 21 November 1994 does not mention the forfeiture of the right to the assistance and the release of the sum; those consequences are apparent only from the letter of 31 January 1997.