Index: Riskeer/Common/src/Riskeer.Common.Data/MechanismSurfaceLineBase.cs
===================================================================
diff -u -ra0378cadf944b95bb06082166b5d3fedc5239e36 -r46ca6081f1adbbddf7c707fca8c425a0394bb735
--- Riskeer/Common/src/Riskeer.Common.Data/MechanismSurfaceLineBase.cs	(.../MechanismSurfaceLineBase.cs)	(revision a0378cadf944b95bb06082166b5d3fedc5239e36)
+++ Riskeer/Common/src/Riskeer.Common.Data/MechanismSurfaceLineBase.cs	(.../MechanismSurfaceLineBase.cs)	(revision 46ca6081f1adbbddf7c707fca8c425a0394bb735)
@@ -190,7 +190,7 @@
             Point2D firstLocalPoint = LocalGeometry.First();
             Point2D lastLocalPoint = LocalGeometry.Last();
             var roundedLocalCoordinateL = new RoundedDouble(numberOfDecimalPlaces, localCoordinateL);
-            return firstLocalPoint.X <= roundedLocalCoordinateL && lastLocalPoint.X >= roundedLocalCoordinateL;
+            return !(firstLocalPoint.X > roundedLocalCoordinateL) && !(lastLocalPoint.X < roundedLocalCoordinateL);
         }
 
         public override string ToString()