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It depends on how high, complete and a robust of a wall we're talking about. The wall rules in the BRB are more about the half-crumbled, ruined walls of a building that's been shelled by artillery. If you're talking about something along the lines of the ramparts of a castle, it doesn't completely work. But using standard rules, there are a number of other rules you could apply:
1. Line of sight: In order to shoot or assault a target, you need to have line of sight of it. If the unit is completely hidden behind the castle wall, then they can't be assaulted.
2. Impassable terrain: Due to their height and/or engineering, you could classify the castle wall as Impassable Terrain.
Alternatively, if your models are standing on top of the wall and are in view of the enemy, they still have to charge both, the horizontal distance between themselves and the wall, as well as the vertical distance between the ground and your models. And if you want to Homebrew some extra penalties - such as always considering the vertical wall as "Difficult terrain" (resulting in a -2 on the charge roll) or the defenders are allowed a better Overwatch (BS: 2?) due to the time needed to climb and/or how the attackers are more exposed/vulnerable while climbing the wall.
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