Wierd error with gateways

[Thor the Bassist]

Well I'm testing out some features on my WIP Helms Deep map for Middle Earth Total War and most of it is going swimmingly. The Deeping Wall is fully assaultable, all the custom walls can be walked on. I then have one thing left - the gate. So I increase the gate height to the one that fits my gateway, I move the gate slightly and it all fits. Then I test it by attacking it only to find that the battering ram cannot attack the gate - it simply says "this unit cannot attack towers" even though it describes the gate as "Wooden Gate".

This is really wierd as the gate isn't a new gate it is the bog standard gate used in all gateways and I have already used the same battering ram in other maps with different gateways. The only different thing is the gateway but this still means I should be able to attack the gate.

The worst I was expecting for was that I would be able to tell the unit to attack and then it would not move like it does if you try to tell it to move somewhere it cannot but I was never expecting it to tell me the unit couldn't attack the gate.

This really has me vexed so any help would be appreciated.