Index: Ringtoets/Piping/src/Ringtoets.Piping.Data/PipingCalculationScenario.cs
===================================================================
diff -u -r77b27109212e94d58eb47248d4210f7eac243fb6 -r368311770b497bb4b7dec2640eb99692c39dd7fa
--- Ringtoets/Piping/src/Ringtoets.Piping.Data/PipingCalculationScenario.cs	(.../PipingCalculationScenario.cs)	(revision 77b27109212e94d58eb47248d4210f7eac243fb6)
+++ Ringtoets/Piping/src/Ringtoets.Piping.Data/PipingCalculationScenario.cs	(.../PipingCalculationScenario.cs)	(revision 368311770b497bb4b7dec2640eb99692c39dd7fa)
@@ -42,7 +42,7 @@
             : base(generalInputParameters)
         {
             IsRelevant = true;
-            contribution = new RoundedDouble(2, 1.0);
+            contribution = new RoundedDouble(4, 1.0);
         }
 
         public bool IsRelevant { get; set; }
Index: Ringtoets/Piping/test/Ringtoets.Piping.Data.Test/PipingCalculationScenarioTest.cs
===================================================================
diff -u -r8b37c0f11e7d78b71c298763124973e94845c87b -r368311770b497bb4b7dec2640eb99692c39dd7fa
--- Ringtoets/Piping/test/Ringtoets.Piping.Data.Test/PipingCalculationScenarioTest.cs	(.../PipingCalculationScenarioTest.cs)	(revision 8b37c0f11e7d78b71c298763124973e94845c87b)
+++ Ringtoets/Piping/test/Ringtoets.Piping.Data.Test/PipingCalculationScenarioTest.cs	(.../PipingCalculationScenarioTest.cs)	(revision 368311770b497bb4b7dec2640eb99692c39dd7fa)
@@ -25,6 +25,7 @@
 using Core.Common.TestUtil;
 using NUnit.Framework;
 using Ringtoets.Common.Data.Calculation;
+using Ringtoets.Common.Data.TestUtil;
 using Ringtoets.Piping.Data.TestUtil;
 
 namespace Ringtoets.Piping.Data.Test
@@ -46,6 +47,7 @@
             Assert.IsInstanceOf<ICalculationScenario>(scenario);
 
             Assert.IsTrue(scenario.IsRelevant);
+            Assert.AreEqual(4, scenario.Contribution.NumberOfDecimalPlaces);
             Assert.AreEqual((RoundedDouble) 1.0, scenario.Contribution);
             Assert.AreEqual(CalculationScenarioStatus.NotCalculated, scenario.Status);
         }
@@ -66,19 +68,20 @@
         }
 
         [Test]
-        [TestCase(1)]
-        [TestCase(15.0)]
-        public void Contribution_Always_ReturnsSetValue(double newValue)
+        public void Contribution_Always_ReturnsSetValue()
         {
             // Setup
+            var random = new Random(21);
+            RoundedDouble roundedDouble = random.NextRoundedDouble();
+
             var scenario = new PipingCalculationScenario(new GeneralPipingInput());
-            var roundedDouble = (RoundedDouble) newValue;
 
             // Call
             scenario.Contribution = roundedDouble;
 
             // Assert
-            Assert.AreEqual(roundedDouble, scenario.Contribution);
+            Assert.AreEqual(4, scenario.Contribution.NumberOfDecimalPlaces);
+            Assert.AreEqual(roundedDouble, scenario.Contribution, scenario.Contribution.GetAccuracy());
         }
 
         [Test]