If it's anything like the A330 then it's limited to 67° angle of bank, 20° nose-up, etc.
If you put the joystick hard-over at any point in flight the plane will roll over to 67° AoB and stay there as long as you hold the joystick in that position, then when you release the stick it'll reduce the roll to 30°. (That right, 'Bus people?)