A difference in the paperwork rules between the Premier League and EFL was the reason Liverpool's move for Fabio Carvalho collapsed.
The Reds were keen to get a deal done for the Portuguese attacker on transfer deadline day.
A fee had been agreed between both Liverpool and Fulham, and as the clock ticked towards the 11pm deadline negotiations were rushed through to try and get the relevant paperwork and Carvalho's medical done.