Hey everyone,
I've come across what seems like a potential issue, though I'm not entirely sure if it's a bug, an oversight, or intended application of the clause. It appears that players can avoid paying the "percentage of next sale" clause when selling a player by structuring the deal in a specific way. If you arrange the transfer so that no money is paid upfront or in monthly installments, and instead, the entire cost of the transfer is paid after a certain number of league games (even just one), or if you spread out the fee per league appearances, the clause isn't enforced and all the money is added to your budget.