Cannot re-sign players

[spireross]

Usure if this is the right place or even if it's intended but surely it's wrong if so. I'm currently managing Albirex (s) A Japanese club playing in Singapore. The transfer policy is that I can only sign Japanese players, that's fair, what isn't is that I cannot resign any players who are already at the club including players that came through the youth system. It means I lose the majority of my youth players after a couple of seasons as they're 99% from Singapore. 

Please tell me if this it's how it's intended to be but it seems wrong to me. I cannot imagine a club IRL refusing to offer contracts to players already at the club due to a policy on bringing players in.