From d638c1d04d4b22ca15eba0d80c706a976c3f4c78 Mon Sep 17 00:00:00 2001
From: Paul Larsen <plarsen@volian.com>
Date: Thu, 30 Apr 2026 15:21:20 -0400
Subject: [PATCH] 
 C2026-027-New-Set_At_All_Level-in-the-Applicability-tab-evaluate-having-the-button-grayed-out-for-the-RNO-column-3

---
 .../DisplayApplicability.cs                   | 30 +++++++++++--------
 1 file changed, 18 insertions(+), 12 deletions(-)

diff --git a/PROMS/Volian.Controls.Library/DisplayApplicability.cs b/PROMS/Volian.Controls.Library/DisplayApplicability.cs
index 77342c37..e68ced7a 100644
--- a/PROMS/Volian.Controls.Library/DisplayApplicability.cs
+++ b/PROMS/Volian.Controls.Library/DisplayApplicability.cs
@@ -69,13 +69,16 @@ namespace Volian.Controls.Library
 					{
 						MyItemInfo = _MyDisplayTabItem.MyItemInfo;
 					}
-					if (MyItemInfo.IsRNOPart == true)
+					if (MyItemInfo != null)
 					{
-						btnApplicabilitychg.Enabled = false;
-					}
-					else
-					{
-						btnApplicabilitychg.Enabled = true;
+						if (MyItemInfo.IsRNOPart == true)  // Check if step is an RNO disable "Set All To Level" button.
+						{
+							btnApplicabilitychg.Enabled = false;
+						}
+						else
+						{
+							btnApplicabilitychg.Enabled = true;
+						}
 					}
 				}
 			}
@@ -402,13 +405,16 @@ namespace Volian.Controls.Library
 				if (_MyItemInfo != null)
 				{
 					if (this.Visible == false) return;
-					if (_MyItemInfo.IsRNOPart == true) // Check if step is an RNO disable "Set All To Level" button.
+					if (MyItemInfo != null)
 					{
-						btnApplicabilitychg.Enabled = false;
-					}
-					else
-					{
-						btnApplicabilitychg.Enabled = true;
+						if (MyItemInfo.IsRNOPart == true)  // Check if step is an RNO disable "Set All To Level" button.
+						{
+							btnApplicabilitychg.Enabled = false;
+						}
+						else
+						{
+							btnApplicabilitychg.Enabled = true;
+						}
 					}
 					IItemConfig cfg = _MyItemInfo.MyConfig as IItemConfig;
 					List<int> apples = cfg.MasterSlave_Applicability.GetFlags();