I try to create internal polygon within existing polygon. After I created a ring, I add a new feature inside the ring. Suddenly, this new feature disappears. I confirmed that this feature went to the origin( 0,0).
The polygon and project file are used UTM as projection.
If somebody knows, why it is happening, let me know the reason and solution.
QGIS:1.8.0 OS:Windows 7
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