Cause

The target functions of a connection have a conflicting entry for the Subtrade property. This can occur when, for example, a connection exists between functions belonging to the subtrades "Water cooling" and "Oil cooling".

Solution

Assign matching Subtrade property data to the connection targets. The subtrade can be set for each function in the Properties <...> dialog, on the first tab.

Refresh the connections and then start a new check run.