Index: Ringtoets/ClosingStructures/src/Ringtoets.ClosingStructures.Service/ClosingStructuresCalculationActivity.cs
===================================================================
diff -u -r73597729ce18d3ee00d8036bca8341e9c12f2953 -rf80835301ae973b5439593e81fb640b7ab044340
--- Ringtoets/ClosingStructures/src/Ringtoets.ClosingStructures.Service/ClosingStructuresCalculationActivity.cs	(.../ClosingStructuresCalculationActivity.cs)	(revision 73597729ce18d3ee00d8036bca8341e9c12f2953)
+++ Ringtoets/ClosingStructures/src/Ringtoets.ClosingStructures.Service/ClosingStructuresCalculationActivity.cs	(.../ClosingStructuresCalculationActivity.cs)	(revision f80835301ae973b5439593e81fb640b7ab044340)
@@ -80,6 +80,11 @@
             calculationService = new ClosingStructuresCalculationService();
         }
 
+        protected override bool Validate()
+        {
+            return calculationService.Validate(calculation, assessmentSection);
+        }
+
         protected override void PerformCalculation()
         {
             ClosingStructuresDataSynchronizationService.ClearCalculationOutput(calculation);