It appears that Charlton are legally challenging Sheffield Wednesday points deduction for next season. They are saying it should apply immediately and therefore relegate them.
To be fair, I can see their argument.
Given that the fixtures need to be formulated, I wonder if they will put Gills at home to Charlton/Wednesday etc
The key thing is that the punishment relating to Sheffield Wednesday's rule breaches were made after the Championship regular league season had finished and more importantly by an independent body. If the decision to dock Wednesday 12 points was made prior to the league season finishing then fair enough.
To be honest, I suspect it is just Charlton being desperate to remain in the Championship and I'd be surprised if they get it overturned. With the new season hopefully starting sometime in September, the lawyers aren't going to have an awful lot of time to put their case forward.
It is worth noting that the FFP rules they broke was for the 2017/18 season and may have also had a small impact on the 2018/19 season. Since the 12 points related to prior seasons, it cannot be argued that the team gained an advantage last season by overspending. Hence Charlton can't argue that last season Sheffield Wednesday benefited by 12 points due to the rule break.
If they go down the "but Wigan got docked immediately" route then the rules has always been set as "12 points docked the day they went into admin". Sheffield Wednesday didn't go into admin so completely different set of rules.
I wonder if the reason why other teams are supporting Charlton is because Charlton would be favourites for relegation next season whereas Sheffield Wednesday would be considered more competitive.