IsOpposedToEdge issue

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Hello
i'm trying to extract a given face's vertices by edge loops.
the problem i'm having is edges have unpredictable directions. So i'm using EdgeUse objects' IsOpposedToEdge method to detect which point (StartPoint or StopPoint) of current edge is needed. But the problem is ... sometimes this method gives incorrect result!! For example, for outter edge the loop's direction is counterclockwise and the current edge direction is clockwise. As long as i can understand, in this situation IsOpposedToEdge method should give me TRUE result, but that's not!
Am i doing something wrong? I'm not sure i understand EdgeUse object quite clearly, but i cannot find any good info.
When you have an Edge object, it has two EdgeUses, what's the difference between them?
Maybe there is another way to determine edge direction relative to edgeloop?
PS i'm using inventor 2011, maybe this is a given version issue?
Thanks in advance.