Index: Ringtoets/GrassCoverErosionInwards/test/Ringtoets.GrassCoverErosionInwards.Service.Test/GrassCoverErosionInwardsCalculationServiceTest.cs
===================================================================
diff -u -raa019c917497b6ef42da091940f29e64fd82fc19 -r7d4fdb527410c89577828ea5d84896945341bae8
--- Ringtoets/GrassCoverErosionInwards/test/Ringtoets.GrassCoverErosionInwards.Service.Test/GrassCoverErosionInwardsCalculationServiceTest.cs	(.../GrassCoverErosionInwardsCalculationServiceTest.cs)	(revision aa019c917497b6ef42da091940f29e64fd82fc19)
+++ Ringtoets/GrassCoverErosionInwards/test/Ringtoets.GrassCoverErosionInwards.Service.Test/GrassCoverErosionInwardsCalculationServiceTest.cs	(.../GrassCoverErosionInwardsCalculationServiceTest.cs)	(revision 7d4fdb527410c89577828ea5d84896945341bae8)
@@ -22,6 +22,7 @@
 using System;
 using System.IO;
 using System.Linq;
+using Core.Common.Base.Data;
 using Core.Common.Base.Geometry;
 using Core.Common.TestUtil;
 using NUnit.Framework;
@@ -31,7 +32,6 @@
 using Ringtoets.Common.Data.DikeProfiles;
 using Ringtoets.Common.Data.FailureMechanism;
 using Ringtoets.GrassCoverErosionInwards.Data;
-using Ringtoets.HydraRing.Calculation.Calculator;
 using Ringtoets.HydraRing.Calculation.Calculator.Factory;
 using Ringtoets.HydraRing.Calculation.Parsers;
 using Ringtoets.HydraRing.Calculation.TestUtil.Calculator;
@@ -186,7 +186,8 @@
                 Name = name,
                 InputParameters =
                 {
-                    HydraulicBoundaryLocation = new HydraulicBoundaryLocation(1, "name", 2, 2)
+                    HydraulicBoundaryLocation = new HydraulicBoundaryLocation(1, "name", 2, 2),
+                    Orientation = (RoundedDouble) 0
                 }
             };
 
@@ -245,6 +246,50 @@
         }
 
         [Test]
+        public void Validate_ValidInputAndInvalidOrientation_ReturnsFalse()
+        {
+            // Setup
+            var grassCoverErosionInwardsFailureMechanism = new GrassCoverErosionInwardsFailureMechanism();
+
+            var mockRepository = new MockRepository();
+            var assessmentSectionStub = CreateAssessmentSectionStub(grassCoverErosionInwardsFailureMechanism, mockRepository);
+            mockRepository.ReplayAll();
+
+            const string name = "<very nice name>";
+
+            GrassCoverErosionInwardsCalculation calculation = new GrassCoverErosionInwardsCalculation()
+            {
+                Name = name,
+                InputParameters =
+                {
+                    HydraulicBoundaryLocation = new HydraulicBoundaryLocation(1, "name", 2, 2),
+                    DikeProfile = new DikeProfile(new Point2D(0, 0), new RoughnessPoint[0], new Point2D[0],
+                                                  null, new DikeProfile.ConstructionProperties()
+                                                  {
+                                                      Orientation = (RoundedDouble) double.NaN
+                                                  })
+                }
+            };
+
+            // Call
+            bool isValid = false;
+            Action call = () => isValid = new GrassCoverErosionInwardsCalculationService().Validate(calculation, assessmentSectionStub);
+
+            // Assert
+            TestHelper.AssertLogMessages(call, messages =>
+            {
+                var msgs = messages.ToArray();
+                Assert.AreEqual(3, msgs.Length);
+                StringAssert.StartsWith(string.Format("Validatie van '{0}' gestart om: ", name), msgs[0]);
+                Assert.AreEqual("Validatie mislukt: Er is geen concreet getal ingevoerd voor 'oriëntatie'.", msgs[1]);
+                StringAssert.StartsWith(string.Format("Validatie van '{0}' beëindigd om: ", name), msgs[2]);
+            });
+            Assert.IsFalse(isValid);
+
+            mockRepository.VerifyAll();
+        }
+
+        [Test]
         [TestCase(true, 10.0)]
         [TestCase(false, 10.0)]
         [TestCase(false, double.NaN)]