diff --git a/PROMS/Volian.Controls.Library/DisplayApplicability.cs b/PROMS/Volian.Controls.Library/DisplayApplicability.cs
index d7d8fbae..03cbc255 100644
--- a/PROMS/Volian.Controls.Library/DisplayApplicability.cs
+++ b/PROMS/Volian.Controls.Library/DisplayApplicability.cs
@@ -211,8 +211,16 @@ namespace Volian.Controls.Library
 			List<InvalidTransition> invalidTrans = WillTransitionsBeValidCommand.Execute(MyItemInfo.ItemID, MyApplicability);
 			if (invalidTrans.Count == 0)
 			{
-				StepConfig sc = MyItemInfo.MyConfig as StepConfig;
-				sc.MasterSlave_Applicability = Volian.Base.Library.BigNum.MakeBigNum(MyApplicability);
+				if (MyItemInfo.IsSection)
+				{
+					SectionConfig sc = MyItemInfo.MyConfig as SectionConfig;
+					sc.MasterSlave_Applicability = Volian.Base.Library.BigNum.MakeBigNum(MyApplicability);
+				}
+				else
+				{
+					StepConfig sc = MyItemInfo.MyConfig as StepConfig;
+					sc.MasterSlave_Applicability = Volian.Base.Library.BigNum.MakeBigNum(MyApplicability);
+				}
 			}
 			else
 			{