Article 3 4.

In the case of interoperable systems, each system determines in its own rules the moment of entry into its system, in such a way as to ensure, to the extent possible, that the rules of all interoperable systems concerned are coordinated in this regard. Unless expressly provided for by the rules of all the systems that are party to the interoperable systems, one system's rules on the moment of entry shall not be affected by any rules of the other systems with which it is interoperable.