(1) The rules of a designated system shall
(a) specify the moment at which a transfer order is to be considered to have been entered into the system,
(b) specify the moment after which a transfer order may not be revoked by a participant or any third party, and
(c) prohibit the revocation by a participant or any third party of a transfer order from the moment specified in accordance with paragraph (b).
(2) In the case of interoperable systems, the rules of each system shall specify the moment of entry into that system in such a way as to ensure, as far as possible, that the rules of all the interoperable systems are coordinated in this regard. Unless expressly provided for by the rules of all the interoperable systems concerned, each system's rules on the moment of entry are not affected by the rules of any other system with which it is interoperable.
(3) In the case of interoperable systems, the rules of each system shall specify the moment of irrevocability from that system in such a
…