Pretty sure that how they explained FFP when the two PSG deals this summer.
The 'outlay' is spread over the length of the contract. 4 year deal today for a £20m player is £5m per year on accounts. the FFP goes off profit/loss on each annual accounts.
As DM said, wages is another part of it, but that's all about annual increase, regardless of profit/loss.
PSG dealings have been massively dodgy. Neymar is down as coming in as a free agent as he bought his contract out at Barca due to the money he got for being a world cup ambassador for Qatar.