Cause

Within a configuration project bus ports that are part of the same physical network <x> are not connected to each other.

Solution

1. Locate the bus ports in the schematic using the Go to (graphic) and Go to 2nd coordinate functionalities from the popup menu of the Message management dialog.
2. Connect the bus ports that belong to the same physical network by inserting the connection symbols (for example angles and / or t-nodes).
3. Then start a new check run.