Index: Riskeer/Common/src/Riskeer.Common.Data/MechanismSurfaceLineBase.cs
===================================================================
diff -u -rae086aefd228d3bc765e9d0b4b92dae66735704b -r134f1023dc7908934487247db2abb60c3604b8d3
--- Riskeer/Common/src/Riskeer.Common.Data/MechanismSurfaceLineBase.cs	(.../MechanismSurfaceLineBase.cs)	(revision ae086aefd228d3bc765e9d0b4b92dae66735704b)
+++ Riskeer/Common/src/Riskeer.Common.Data/MechanismSurfaceLineBase.cs	(.../MechanismSurfaceLineBase.cs)	(revision 134f1023dc7908934487247db2abb60c3604b8d3)
@@ -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()