Index: src/Deltares.DSoilModel.Forms/DSoilModelPlugin.cs
===================================================================
diff -u -r607 -r611
--- src/Deltares.DSoilModel.Forms/DSoilModelPlugin.cs	(.../DSoilModelPlugin.cs)	(revision 607)
+++ src/Deltares.DSoilModel.Forms/DSoilModelPlugin.cs	(.../DSoilModelPlugin.cs)	(revision 611)
@@ -1104,6 +1104,17 @@
             }
 
             var result = true;
+
+            // soil in borings
+            foreach (var b in Project.Borings)
+            {
+                if (b.BoringLayers.Any(x => x.Soil == soil))
+                {
+                    LogErrorCannotDelete(soil, b);
+                    result = false; 
+                }
+            }
+
             // 1D profiles
             foreach (var sp1d in Project.SoilProfiles1D)
             {
Index: src/Deltares.DSoilModel.Forms.Tests/Deltares.DSoilModel.Forms.Tests.csproj
===================================================================
diff -u -r399 -r611
--- src/Deltares.DSoilModel.Forms.Tests/Deltares.DSoilModel.Forms.Tests.csproj	(.../Deltares.DSoilModel.Forms.Tests.csproj)	(revision 399)
+++ src/Deltares.DSoilModel.Forms.Tests/Deltares.DSoilModel.Forms.Tests.csproj	(.../Deltares.DSoilModel.Forms.Tests.csproj)	(revision 611)
@@ -140,6 +140,11 @@
       <Name>Deltares.DSoilModel.Forms</Name>
     </ProjectReference>
   </ItemGroup>
+  <ItemGroup>
+    <Content Include="TestFiles\boring.xml">
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+    </Content>
+  </ItemGroup>
   <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
   <!-- To modify your build process, add your task inside one of the targets below and uncomment it. 
        Other similar extension points exist, see Microsoft.Common.targets.
Index: src/Deltares.DSoilModel.Forms.Tests/TestFiles/boring.xml
===================================================================
diff -u
--- src/Deltares.DSoilModel.Forms.Tests/TestFiles/boring.xml	(revision 0)
+++ src/Deltares.DSoilModel.Forms.Tests/TestFiles/boring.xml	(revision 611)
@@ -0,0 +1 @@
+<?xml version="1.0" encoding="utf-8"?><BoringDefinition xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" Name="B45B0013" Date="1931-01-01" Xworld="153240" Yworld="420500" GroundLevel="4.42" NoRealLevel="false" GroundWaterLevel="987000000" BoringMethod="bmtPuls" MeasurementCodeType="mctUserDefined" FileDate="2015-6-30" LevelText="NAP" XYCoordinateSystem="RD" PreExcavation="0" BoringDiameter="0" TopVoid="-9999.99" BottomVoid="-9999.99" MedianVoid="-9999.99" GammaSatVoid="0" GammaUnsatVoid="0" FixedHorizontalLevel="maaiveld" CompanyId="Onbekend, , 0" xmlns="http://deltares.nl/2008/BoringDefinition"><MeasuredData><Datarow SoilColorAsInt="-2578" TopLevel="4.42" BottomLevel="3.92" SoilName="Undetermined" SandMedian="-9.99999" GammaSat="0" GammaUnsat="0" GEFMaterialCode="K" GEFMaterialName="klei" /><Datarow SoilColorAsInt="-1" TopLevel="3.92" BottomLevel="2.32" SoilName="Loam, ve san, stiff" SandMedian="-9.99999" GammaSat="0" GammaUnsat="0" GEFMaterialCode="Lz3" GEFMaterialName="leem, sterk zandig" /><Datarow SoilColorAsInt="-1" TopLevel="2.32" BottomLevel="1.17" SoilName="Loam, ve san, stiff" SandMedian="-9.99999" GammaSat="0" GammaUnsat="0" GEFMaterialCode="Lz3" GEFMaterialName="leem, sterk zandig" /><Datarow SoilColorAsInt="-2987746" TopLevel="1.17" BottomLevel="0.57" SoilName="Clay, clean, moderate" SandMedian="-9.99999" GammaSat="0" GammaUnsat="0" GEFMaterialCode="Ks1" GEFMaterialName="klei, zwak siltig" /><Datarow SoilColorAsInt="-2987746" TopLevel="0.57" BottomLevel="0.22" SoilName="Clay, clean, moderate" SandMedian="-9.99999" GammaSat="0" GammaUnsat="0" GEFMaterialCode="Ks1" GEFMaterialName="klei, zwak siltig" /><Datarow SoilColorAsInt="-10197916" TopLevel="0.22" BottomLevel="-1.18" SoilName="Peat, mod pl, moderate" SandMedian="-9.99999" GammaSat="0" GammaUnsat="0" GEFMaterialCode="Vk" GEFMaterialName="VK=???" /><Datarow SoilColorAsInt="-2578" TopLevel="-1.18" BottomLevel="-5.58" SoilName="Undetermined" SandMedian="-9.99999" GammaSat="0" GammaUnsat="0" GEFMaterialCode="Zg1" GEFMaterialName="ZG1=???" /></MeasuredData></BoringDefinition>
\ No newline at end of file
Index: src/Deltares.DSoilModel.Forms.Tests/DSoilModelPluginTests.cs
===================================================================
diff -u -r440 -r611
--- src/Deltares.DSoilModel.Forms.Tests/DSoilModelPluginTests.cs	(.../DSoilModelPluginTests.cs)	(revision 440)
+++ src/Deltares.DSoilModel.Forms.Tests/DSoilModelPluginTests.cs	(.../DSoilModelPluginTests.cs)	(revision 611)
@@ -1,4 +1,5 @@
-using System.Linq;
+using System.IO;
+using System.Linq;
 using System.Reflection;
 using System.Threading;
 using System.Windows.Forms;
@@ -307,6 +308,27 @@
         }
 
         [Test]
+        public void CanDeleteSoilTest_Borings()
+        {
+            var p = new DSoilModelProject();
+            plugin.Project = p;
+            var fileName = Path.Combine(GetTestFilesPath(), "boring.xml");
+            Assert.IsTrue(File.Exists(fileName));
+
+            var b = new Boring(File.ReadAllText(fileName), p.Soils);
+            p.Borings.Add(b);
+
+            var soilUsed = new Soil();
+            b.BoringLayers[0].Soil = soilUsed;
+            p.Soils.Add(soilUsed); // we have the soil that in use now. Importer does it for us live.
+            var soilUnused = new Soil();
+            p.Soils.Add(soilUnused);
+
+            Assert.IsTrue(CanDelete(plugin, "CanDeleteSoil", soilUnused));
+            Assert.IsFalse(CanDelete(plugin, "CanDeleteSoil", soilUsed));
+        }
+        
+        [Test]
         public void HandleIsCreated()
         {
             Assert.IsTrue(mainForm.IsHandleCreated);
@@ -384,10 +406,12 @@
 
         private bool CanDelete(DSoilModelPlugin p, string actualCanDeleteName, object obj)
         {
-            return (bool) p.GetType().GetMethod(actualCanDeleteName, BindingFlags.NonPublic | BindingFlags.Instance).Invoke(p, new[]
-            {
-                obj
-            });
+            return (bool) p.GetType().GetMethod(actualCanDeleteName, BindingFlags.NonPublic | BindingFlags.Instance).Invoke(p, new[] { obj });
         }
+
+        private string GetTestFilesPath()
+        {
+            return Path.GetFullPath(@"..\..\Deltares.DSoilModel.Forms.Tests\TestFiles");
+        }
     }
 }
\ No newline at end of file