La ricerca ti conviene farla usando l'identificativo EF (50520), e non l'index:
https://community.punterforum.com/showthread.php?t=238665
https://community.punterforum.com/showthread.php?t=331368
https://community.punterforum.com/showthread.php?t=246918
https://community.punterforum.com/showthread.php?t=225534
https://community.punterforum.com/showthread.php?t=238665
https://community.punterforum.com/showthread.php?t=331368
https://community.punterforum.com/showthread.php?t=246918
https://community.punterforum.com/showthread.php?t=225534