Yes? What is the problem? You didn't actually say what happens, or doesn't happen.
Can you not walk under it at all? If that's the case, it's because of whatever tiles you have on the layers below it.
Can you walk under it but it displays over your character for a short moment? If that's the case, change the priority to 2 or more. 1 will show the tile above your character while you're on a lower tile, and over your character when you are on the same tile.
Also check what tileset you're using. I notice you have an Outside and an Outside - Waterfall. Are they the same/similar? If the map is using the other one, you'll need to check the settings of those tiles on the other tileset as well.
If those ideas don't help, please show a screenshot of your map.