Index: DamEngine/trunk/src/Deltares.DamEngine.Io/DamInput.cs
===================================================================
diff -u -r1554 -r1578
--- DamEngine/trunk/src/Deltares.DamEngine.Io/DamInput.cs	(.../DamInput.cs)	(revision 1554)
+++ DamEngine/trunk/src/Deltares.DamEngine.Io/DamInput.cs	(.../DamInput.cs)	(revision 1578)
@@ -154,6 +154,7 @@
         }
         
         /// <remarks/>
+        [System.Xml.Serialization.XmlArrayAttribute(IsNullable=true)]
         [System.Xml.Serialization.XmlArrayItemAttribute(IsNullable=false)]
         public TimeSerie[] OperationalInputTimeSeries {
             get {