Unknown Connection
The system builds relations among objects in a noun phrase - a report entry is produced when no relation can be found. Most of the time, this is an indication of insufficient modelling. Sometimes, it will show a mistake.
Unknown connection – wheel, chokes
5.49 The Yard Truck shall be fitted with cabinets/compartments to facilitate the storage of least 4 aircraft wheel chokes, each measuring 150mm x 150mm x 600mm.
There is no relation that can combine wheel and choke.