Index: Ringtoets/Piping/src/Ringtoets.Piping.Plugin/PipingPlugin.cs
===================================================================
diff -u -r5f1d410a44f7895c3519e5763497dc30ec492a73 -r26da131fa5dbcf95f9a16de6f81eb4acc8d1be14
--- Ringtoets/Piping/src/Ringtoets.Piping.Plugin/PipingPlugin.cs	(.../PipingPlugin.cs)	(revision 5f1d410a44f7895c3519e5763497dc30ec492a73)
+++ Ringtoets/Piping/src/Ringtoets.Piping.Plugin/PipingPlugin.cs	(.../PipingPlugin.cs)	(revision 26da131fa5dbcf95f9a16de6f81eb4acc8d1be14)
@@ -102,7 +102,8 @@
                 Image = PipingFormsResources.PipingSurfaceLineIcon,
                 FileFilterGenerator = RingtoetsPipingSurfaceLineFileFilter,
                 IsEnabled = IsSurfaceLineImporterEnabled,
-                CreateFileImporter = (context, filePath) => PipingSurfaceLinesCsvImporter(context, filePath, new RingtoetsPipingSurfaceLineReplaceDataStrategy(context.FailureMechanism))
+                CreateFileImporter = (context, filePath) => PipingSurfaceLinesCsvImporter(context, filePath, new RingtoetsPipingSurfaceLineReplaceDataStrategy(context.FailureMechanism)),
+                VerifyUpdates = VerifyPipingSurfaceLineUpdates
             };
 
             yield return new ImportInfo<StochasticSoilModelCollectionContext>
@@ -152,7 +153,8 @@
                 FileFilterGenerator = RingtoetsPipingSurfaceLineFileFilter,
                 IsEnabled = IsSurfaceLineImporterEnabled,
                 CurrentPath = context => context.WrappedData.SourcePath,
-                CreateFileImporter = (context, filePath) => PipingSurfaceLinesCsvImporter(context, filePath, new RingtoetsPipingSurfaceLineUpdateDataStrategy(context.FailureMechanism))
+                CreateFileImporter = (context, filePath) => PipingSurfaceLinesCsvImporter(context, filePath, new RingtoetsPipingSurfaceLineUpdateDataStrategy(context.FailureMechanism)),
+                VerifyUpdates = VerifyPipingSurfaceLineUpdates
             };
 
             yield return new UpdateInfo<StochasticSoilModelCollectionContext>
@@ -1019,6 +1021,14 @@
             }
         }
 
+        private bool VerifyPipingSurfaceLineUpdates(RingtoetsPipingSurfaceLinesContext context)
+        {
+            var changeHandler = new RingtoetsPipingSurfaceLineChangeHandler(context.FailureMechanism,
+                                                                            new DialogBasedInquiryHelper(Gui.MainWindow));
+
+            return !changeHandler.RequireConfirmation() || changeHandler.InquireConfirmation();
+        }
+
         #endregion
     }
 }
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