Index: Ringtoets/Piping/test/Ringtoets.Piping.Plugin.Test/TreeNodeInfos/RingtoetsPipingSurfaceLineCollectionTreeNodeInfoTest.cs
===================================================================
diff -u -rf2f7d22ee59276f5df1f83fd409899bd895ea163 -rd6d1b03ce8dc3c4e6bba565a85ea310f6196adea
--- Ringtoets/Piping/test/Ringtoets.Piping.Plugin.Test/TreeNodeInfos/RingtoetsPipingSurfaceLineCollectionTreeNodeInfoTest.cs	(.../RingtoetsPipingSurfaceLineCollectionTreeNodeInfoTest.cs)	(revision f2f7d22ee59276f5df1f83fd409899bd895ea163)
+++ Ringtoets/Piping/test/Ringtoets.Piping.Plugin.Test/TreeNodeInfos/RingtoetsPipingSurfaceLineCollectionTreeNodeInfoTest.cs	(.../RingtoetsPipingSurfaceLineCollectionTreeNodeInfoTest.cs)	(revision d6d1b03ce8dc3c4e6bba565a85ea310f6196adea)
@@ -94,7 +94,7 @@
             mocks.ReplayAll();
 
             var failureMechanism = new PipingFailureMechanism();
-            var surfaceLines = new ObservableList<RingtoetsPipingSurfaceLine>();
+            var surfaceLines = new ObservableCollectionWithSourcePath<RingtoetsPipingSurfaceLine>();
             var ringtoetsPipingSurfaceLines = new RingtoetsPipingSurfaceLinesContext(surfaceLines, failureMechanism, assessmentSection);
 
             // Call
@@ -112,7 +112,7 @@
             mocks.ReplayAll();
 
             var failureMechanism = new PipingFailureMechanism();
-            var surfaceLines = new ObservableList<RingtoetsPipingSurfaceLine>();
+            var surfaceLines = new ObservableCollectionWithSourcePath<RingtoetsPipingSurfaceLine>();
             var ringtoetsPipingSurfaceLines = new RingtoetsPipingSurfaceLinesContext(surfaceLines, failureMechanism, assessmentSection);
 
             // Call
@@ -130,7 +130,7 @@
             mocks.ReplayAll();
 
             var failureMechanism = new PipingFailureMechanism();
-            var surfaceLines = new ObservableList<RingtoetsPipingSurfaceLine>();
+            var surfaceLines = new ObservableCollectionWithSourcePath<RingtoetsPipingSurfaceLine>();
             var ringtoetsPipingSurfaceLines = new RingtoetsPipingSurfaceLinesContext(surfaceLines, failureMechanism, assessmentSection);
 
             // Call
@@ -148,10 +148,11 @@
             var ringtoetsPipingSurfaceLine1 = new RingtoetsPipingSurfaceLine();
             var ringtoetsPipingSurfaceLine2 = new RingtoetsPipingSurfaceLine();
 
-            var surfaceLines = new ObservableList<RingtoetsPipingSurfaceLine>
+            var surfaceLines = new ObservableCollectionWithSourcePath<RingtoetsPipingSurfaceLine>();
+            surfaceLines.AddRange(new[]
             {
                 ringtoetsPipingSurfaceLine1, ringtoetsPipingSurfaceLine2
-            };
+            }, "path");
 
             var failureMechanism = new PipingFailureMechanism();
 
@@ -174,10 +175,11 @@
             var ringtoetsPipingSurfaceLine1 = new RingtoetsPipingSurfaceLine();
             var ringtoetsPipingSurfaceLine2 = new RingtoetsPipingSurfaceLine();
 
-            var surfaceLines = new ObservableList<RingtoetsPipingSurfaceLine>
+            var surfaceLines = new ObservableCollectionWithSourcePath<RingtoetsPipingSurfaceLine>();
+            surfaceLines.AddRange(new[]
             {
                 ringtoetsPipingSurfaceLine1, ringtoetsPipingSurfaceLine2
-            };
+            }, "path");
 
             var failureMechanism = new PipingFailureMechanism();