Index: Ringtoets/GrassCoverErosionInwards/src/Ringtoets.GrassCoverErosionInwards.Data/DikeProfile.cs
===================================================================
diff -u -r8a6beb11ea0d1200c4dacdc0d9ef4011fdcbb8b9 -r4e7e4a0740ddf86ceb74893155d1f20f95efb342
--- Ringtoets/GrassCoverErosionInwards/src/Ringtoets.GrassCoverErosionInwards.Data/DikeProfile.cs	(.../DikeProfile.cs)	(revision 8a6beb11ea0d1200c4dacdc0d9ef4011fdcbb8b9)
+++ Ringtoets/GrassCoverErosionInwards/src/Ringtoets.GrassCoverErosionInwards.Data/DikeProfile.cs	(.../DikeProfile.cs)	(revision 4e7e4a0740ddf86ceb74893155d1f20f95efb342)
@@ -74,13 +74,15 @@
             }
             set
             {
-                if (value < 0.0 || value > 360.0)
+                var roundedValue = value.ToPrecision(orientation.NumberOfDecimalPlaces);
+
+                if (roundedValue < 0.0 || roundedValue > 360.0)
                 {
-                    string message = string.Format(Resources.DikeProfile_Orientation_Value_0_should_be_in_interval, value.Value);
+                    string message = string.Format(Resources.DikeProfile_Orientation_Value_0_should_be_in_interval, roundedValue);
                     throw new ArgumentOutOfRangeException("value", message);
                 }
 
-                orientation = value.ToPrecision(orientation.NumberOfDecimalPlaces);
+                orientation = roundedValue;
             }
         }
 
Index: Ringtoets/GrassCoverErosionInwards/test/Ringtoets.GrassCoverErosionInwards.Data.Test/DikeProfileTest.cs
===================================================================
diff -u -r8a6beb11ea0d1200c4dacdc0d9ef4011fdcbb8b9 -r4e7e4a0740ddf86ceb74893155d1f20f95efb342
--- Ringtoets/GrassCoverErosionInwards/test/Ringtoets.GrassCoverErosionInwards.Data.Test/DikeProfileTest.cs	(.../DikeProfileTest.cs)	(revision 8a6beb11ea0d1200c4dacdc0d9ef4011fdcbb8b9)
+++ Ringtoets/GrassCoverErosionInwards/test/Ringtoets.GrassCoverErosionInwards.Data.Test/DikeProfileTest.cs	(.../DikeProfileTest.cs)	(revision 4e7e4a0740ddf86ceb74893155d1f20f95efb342)
@@ -88,9 +88,24 @@
         }
 
         [Test]
+        [TestCase(-1e-3, 0.0)]
+        [TestCase(360 + 1e-3, 360.0)]
+        public void Orientation_SetValueThatIsNoLongerIllegalAfterRounding_RoundedValueIsSet(double newValue, double expectedRoundedValue)
+        {
+            // Setup
+            var dikeProfile = new DikeProfile(new Point2D(0, 0));
+
+            // Call
+            dikeProfile.Orientation = (RoundedDouble) newValue;
+
+            // Assert
+            Assert.AreEqual(expectedRoundedValue, dikeProfile.Orientation.Value);
+        }
+
+        [Test]
         [TestCase(-987.65)]
-        [TestCase(-1e-6)]
-        [TestCase(360 + 1e-6)]
+        [TestCase(-1e-2)]
+        [TestCase(360 + 1e-2)]
         [TestCase(875.12)]
         public void Orientation_SetIllegalValue_ThrowsArgumentOutOfRangeException(double invalidNewValue)
         {
@@ -102,7 +117,7 @@
 
             // Assert
             string expectedMessage = String.Format("De dijkprofiel oriëntatie waarde {0} moet in het interval [0, 360] liggen.",
-                                                   invalidNewValue);
+                                                   new RoundedDouble(dikeProfile.Orientation.NumberOfDecimalPlaces, invalidNewValue));
             TestHelper.AssertThrowsArgumentExceptionAndTestMessage<ArgumentOutOfRangeException>(call, expectedMessage);
         }