If the owners are of different nationalities, they have to determine the nationality of the horse. 4. When the Fédération équestre internationale approves the leasing of a horse by a national equestrian federation, the details of these transactions must be recorded by the national equestrian federation concerned. ###>When the Fédération équestre internationale approves the leasing of a horse by a national equestrian federation, the details of these transactions must be recorded by the national equestrian federation concerned.