Popids

I am having an issue playing online with some mates. I loaned in a player with option to buy in the end of the season but I cannot exercise it until the season is over due to 6 maximum under 21 rule per year. My questions are : 1- When can I buy under 21 players again ? 2- is it possible for the club owner of the player to accept offers while on loan to my team even when I have an option to buy without the host making changes in the game editor?