SFC2021 enforces the "four-eyes" principle, which means that the user who last validated the Object cannot submit it. Two different users are required; one to validate and another to send.
According to Article 69(9) of Commission Implementing Regulation (EU) No 2021/1060 regarding the electronic data exchange system between the Member States and the Commission, one of the responsibilities of the Member State is “Ensuring the verification of information submitted by a person other than the person who entered the data for that transmission”