Battlemaps and Fords ?

How do you add fords to battle maps?
Is there a limit to how many u can add ?

MY problem is this, I get quite easily get one ford onto a map and it works fine.

But I would like at least two, one at either end of the battle map to allow for more than one crossing point. But no matter what I try I cant manually add a second ford.

So far the only way I have found around this is to eliminate the river and make manual crossing points, which defeats the idea of having a number of fords.

Can anybody help ?