I'm Sporting and I have three feeder clubs in the Liga Vitalis: Portimonense, E. Amadora, and Fatima. For some reason, all of my players on loan for the first two couldn't play in the league matches (they could only play in the cup and non-competitive matches). When I looked at the teams, it said the player in question was ineligible because he was a "homegrown player from same nation as club." I've never run into this before, what's going on?