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i am trying to move a polygon from a location to another location. when using the move tool (editor) in ArcGIS, I place the x and y values to where i will move the polygon. however, when pressing enter, a message stating that the feature has null z values appear. how do I solve this problem?

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Please provide some additional detail. What storage type are your features in? Is it a shapefile, geodatabase, etc? What projection? – Get Spatial Oct 18 '12 at 5:36

Seems that the feature you are trying to edit was defined with Z value (elevation), yet the polygon doesn't have any z value, hence null.

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