Index: Ringtoets/Piping/test/Ringtoets.Piping.Service.Test/PipingCalculationServiceTest.cs
===================================================================
diff -u -r8905298103eb01ce13dd5c1a2f267f879d4fda3e -r62cd6e02ab9b63a64de1cc9e3a51ab776c7aab67
--- Ringtoets/Piping/test/Ringtoets.Piping.Service.Test/PipingCalculationServiceTest.cs	(.../PipingCalculationServiceTest.cs)	(revision 8905298103eb01ce13dd5c1a2f267f879d4fda3e)
+++ Ringtoets/Piping/test/Ringtoets.Piping.Service.Test/PipingCalculationServiceTest.cs	(.../PipingCalculationServiceTest.cs)	(revision 62cd6e02ab9b63a64de1cc9e3a51ab776c7aab67)
@@ -22,6 +22,7 @@
 using System;
 using System.Linq;
 using Core.Common.Base.Data;
+using Core.Common.Base.Geometry;
 using Core.Common.TestUtil;
 using NUnit.Framework;
 using Ringtoets.Common.Data.TestUtil;
@@ -250,6 +251,46 @@
         }
 
         [Test]
+        public void Validate_WithSurfaceLineOneOutOfFourDitchPoints_LogsErrorAndReturnsFalse()
+        {
+            // Setup
+            const string name = "<very nice name>";
+
+            Point3D[] geometry = testCalculation.InputParameters.SurfaceLine.Points;
+            var surfaceLineName = "surfaceLineA";
+            var surfaceLineMissingCharacteristicPoint = new RingtoetsPipingSurfaceLine
+            {
+                Name = surfaceLineName
+            };
+            surfaceLineMissingCharacteristicPoint.SetGeometry(geometry);
+            surfaceLineMissingCharacteristicPoint.SetDitchDikeSideAt(geometry[2]);
+
+            testCalculation.InputParameters.SurfaceLine = surfaceLineMissingCharacteristicPoint;
+            testCalculation.InputParameters.ExitPointL = (RoundedDouble) 0.9;
+            testCalculation.InputParameters.EntryPointL = (RoundedDouble) 0.1;
+            testCalculation.Name = name;
+
+            // Call
+            bool isValid = false;
+            Action call = () => isValid = PipingCalculationService.Validate(testCalculation);
+
+            // Assert
+            TestHelper.AssertLogMessages(call, messages =>
+            {
+                string[] msgs = messages.ToArray();
+                Assert.AreEqual(3, msgs.Length);
+                StringAssert.StartsWith(string.Format("Validatie van '{0}' gestart om: ", name), msgs.First());
+
+                var expected = string.Format(
+                    "Validatie mislukt: De sloot in de hoogtegeometrie {0} is niet correct. Niet alle 4 punten zijn gedefinieerd of de volgorde is incorrect.",
+                    surfaceLineName);
+                Assert.AreEqual(expected, msgs[1]);
+                StringAssert.StartsWith(string.Format("Validatie van '{0}' beëindigd om: ", name), msgs.Last());
+            });
+            Assert.IsFalse(isValid);
+        }
+
+        [Test]
         public void Validate_WithoutStochasticSoilProfile_LogsErrorAndReturnsFalse()
         {
             // Setup