As mentioned in subject, when click ‘Delete’ when focused on Interaction Use, I can delete Interaction Use but can’t delete Duration Constraint at the same time. I can’t ‘Delete’ the Duration Constraint sequentially either.
The only method, pretty manually, is to go to Interaction Use > Right Click > Open Specification > Duration Constraint tab > Constraint value. Delete all of it should be enough to solve the problem.
P/s: I’ve experienced a very dangerous bug. If that Interaction Use is deleted from a long time ago (too many updated that can’t be Ctrl+Z), the Duration Constraint has no idea where it came from and it stay there forever :v