Is that actually a rule in real life?
As an example I'm just looking up Fabio and Rafael, and I paraphrase from Wikipedia: "The twin brother signed from Fluminense in February 2007, but were unable to take part in matches until they turned 18 in July 2008."
Guessing that's the same rule?
Is there a database edit that can change this? I have the "No Work Permits" edit and I was wondering if that would work?