Map Help - Church Tower Elevation

[Cross]

I'm just finishing up a Normandy map and would like to make sure units in church buildings get a good view of the surrounding countryside.

With church on level ground I tried adding a single level 4 hill hex within the church. This works quite well, the six surrounding hexes are then slopes. But it doesn't always seem to stay this way once I save the map and reopen it.

Worse case scenario: I will just make a small hill and then position the churches on hills.

Has anyone already fiddled with this and have a good solution?

Perhaps you have some insight Don?

Thanks,
Cross