Index: src/Deltares.DSoilModel.Forms/DSoilModelGeometryEditor.cs
===================================================================
diff -u -r240 -r246
--- src/Deltares.DSoilModel.Forms/DSoilModelGeometryEditor.cs	(.../DSoilModelGeometryEditor.cs)	(revision 240)
+++ src/Deltares.DSoilModel.Forms/DSoilModelGeometryEditor.cs	(.../DSoilModelGeometryEditor.cs)	(revision 246)
@@ -546,12 +546,34 @@
                 return;
             }
 
+            UndoRedoManager.Instance.BeginAction();
             var profile = spatialEditor.EmptySelection.DataObject as SoilProfile1D;
-            profile.Layers.Clear();
+            ClearGeometryForSoilProfile1D(profile);
 
-            DataEventPublisher.DataListModified(profile.Layers);
+            UndoRedoManager.Instance.EndAction();
+
+            // in order to trigger refresh we select the 1st dummy object and then we reselect the "cleared" one
+            DataEventPublisher.SelectionChanged(new SoilProfile1D());
+            DataEventPublisher.SelectionChanged(profile);
         }
 
+        public void ClearGeometryForSoilProfile1D(SoilProfile1D profile)
+        {
+            foreach (var lookup in Project.BoringLookup1Ds.Where(b => b.SoilProfile1D == profile).ToList())
+            {
+                Project.BoringLookup1Ds.Remove(lookup);
+                boringLookup1Ds.Remove(lookup);
+            }
+
+            foreach (var lookup in Project.CptLookup1Ds.Where(p => p.SoilProfile1D == profile).ToList())
+            {
+                Project.CptLookup1Ds.Remove(lookup);
+                cptLookup1Ds.Remove(lookup);
+            }
+
+            profile.Layers.Clear();
+        }
+
         private void ExecuteClearSoilProfile2DCommand()
         {
             if (!AskUserWantsToClearSoilProfile2D())
Index: src/Deltares.DSoilModel.Forms.Tests/DSoilModelGeometryEditorTests.cs
===================================================================
diff -u -r240 -r246
--- src/Deltares.DSoilModel.Forms.Tests/DSoilModelGeometryEditorTests.cs	(.../DSoilModelGeometryEditorTests.cs)	(revision 240)
+++ src/Deltares.DSoilModel.Forms.Tests/DSoilModelGeometryEditorTests.cs	(.../DSoilModelGeometryEditorTests.cs)	(revision 246)
@@ -39,6 +39,16 @@
             return p;
         }
 
+        private DSoilModelProject CreateProjectForSoilProfile1D(SoilProfile1D profile)
+        {
+            var p = new DSoilModelProject();
+
+            p.BoringLookup1Ds.Add(new BoringLookup1D { SoilProfile1D = profile });
+            p.CptLookup1Ds.Add(new ConePenetrationTestLookup1D { SoilProfile1D = profile });
+
+            return p;
+        }
+
         private SoilProfile2D CreateSoilProfile2D()
         {
             var profile = new SoilProfile2D();
@@ -50,8 +60,32 @@
 
             return profile;
         }
+        
+        private SoilProfile1D CreateSoilProfile1D()
+        {
+            var profile = new SoilProfile1D();
 
+            profile.Layers.Add(new SoilLayer1D());
+            profile.Layers.Add(new SoilLayer1D());
+            
+            return profile;
+        }
+
         [Test]
+        public void ClearGeometryForSoilProfile1DTest()
+        {
+            var soilProfile1D = CreateSoilProfile1D();
+            geometryEditor.Project = CreateProjectForSoilProfile1D(soilProfile1D);
+
+            geometryEditor.ClearGeometryForSoilProfile1D(soilProfile1D);
+
+            Assert.IsEmpty(geometryEditor.Project.BoringLookup1Ds);
+            Assert.IsEmpty(geometryEditor.Project.CptLookup1Ds);
+            
+            Assert.IsEmpty(soilProfile1D.Layers);
+        }
+
+        [Test]
         public void ClearGeometryForSoilProfile2DTest()
         {
             var soilProfile2D = CreateSoilProfile2D();