(9)To ensure that the rights of third parties are respected, a competent authority should exercise the powers set out in Article 21 of Regulation (EU) No 795/2014 (ECB/2014/28) in accordance with, and subject to, the general principles of proportionality, equal treatment, effectiveness, efficiency, transparency and procedural due process. In addition, in order to comply with these principles, a decision to exercise the oversight powers set out in Article 21 of Regulation (EU) No 795/2014 (ECB/2014/28) should have a minimum predefined content and be notified to the SIPS operator before any oversight power is exercised.