Why can not I change the map of the water level?

[Beer.114]

Water.con there is no water level data
Invalid BF2Editor save

[Rhino]

Heightdata.con
heightmapcluster.setSeaWaterLevel ***

But you can't just change the sea water level and be done with it. Changing it requires new terrain lightmaps for it to work properly.

[Beer.114]

Thank you for your help