It isn't a problem - I know about applying the default flags after I alter the terrain - my question is can I purposefully control this "false" terrain? If I can, then I may be able to simulate lakes or ponds at high elevations.
Perhaps I wasn't clear the first time, so I will try again...
Occasionally, I have modified terrain in WrpEdit which then appears as hills, etc. in OFP. Every now and then, the ground is "false," the player will walk "into" the ground, giving the illusion that he is walking into the sea. If whatever causes this can be replicated, one would be able to place "lakes" at elevations above 0m.