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How to fix polylines with vertical segments in ArcGIS

When copy-pasting polylines from one feature class to another, you may face this error:

Figure 1: Paste error: Polylines with vertical segments cannot be stored in pre-10.0 geodatabase feature classes.

One way to fix this issue is to find all vertical segments in the polylines and move either top or bottom vertex of the vertical segments slightly. However, this manual fix is not ideal when there are many polyline features. You can use the Feature To Line tool to fix the vertical segment issue.

Figure 2: Feature To Line tool.