Problem: Polygon-Polyline intersection ignores the orientation of the original polyline
This problem is addressed in ArcGIS 8.1 Service Pack 1. See the Related Information section to download this pack.
When writing code to do a polygon-polyline intersection, the orientation of the resulting polyline should be in the same direction as the original polyline, but this is not always the case.
This is a known issue.
Solution or Workaround
There is no simple work-around for this issue.