diff --git a/PROMS/VEPROMS User Interface/frmVEPROMS.cs b/PROMS/VEPROMS User Interface/frmVEPROMS.cs
index 10210c96..d998f451 100644
--- a/PROMS/VEPROMS User Interface/frmVEPROMS.cs	
+++ b/PROMS/VEPROMS User Interface/frmVEPROMS.cs	
@@ -11,7 +11,6 @@ using System.IO;
 using System.Configuration;
 using System.Reflection;
 using VEPROMS.CSLA.Library;
-//using Csla;
 using DevComponents;
 using DevComponents.DotNetBar;
 using DevComponents.DotNetBar.Rendering;
diff --git a/PROMS/Volian.Controls.Library/DisplayApplicability.Designer.cs b/PROMS/Volian.Controls.Library/DisplayApplicability.Designer.cs
index cc37fbea..0faa9a92 100644
--- a/PROMS/Volian.Controls.Library/DisplayApplicability.Designer.cs
+++ b/PROMS/Volian.Controls.Library/DisplayApplicability.Designer.cs
@@ -49,7 +49,7 @@ namespace Volian.Controls.Library
 			this.btnApplicabilitychg.Size = new System.Drawing.Size(80, 22);
 			this.btnApplicabilitychg.Margin = new System.Windows.Forms.Padding(2);
 			this.btnApplicabilitychg.RightToLeft = System.Windows.Forms.RightToLeft.No;
-			this.superTooltip1.SetSuperTooltip(this.btnApplicabilitychg, new DevComponents.DotNetBar.SuperTooltipInfo("Change applicability settings - All At Level", "", "When clicked, all steps at the level of the current step will have their applicability settings changed. Note that for two column procedures, the left column and right column are handled separately.", null, null, DevComponents.DotNetBar.eTooltipColor.Gray));
+			this.superTooltip1.SetSuperTooltip(this.btnApplicabilitychg, new DevComponents.DotNetBar.SuperTooltipInfo("Change applicability settings - All At Level", "", "When clicked, all sub-steps at that level of the current step will be set to the selected applicability.  Note that this button is disabled when on a RNO step type but enabled for sub-step under it.", null, null, DevComponents.DotNetBar.eTooltipColor.Gray));
 			this.btnApplicabilitychg.TabIndex = 0;
 			this.btnApplicabilitychg.Text = "Set All at Level";
 			this.btnApplicabilitychg.ColorTable = DevComponents.DotNetBar.eButtonColor.BlueOrb;
diff --git a/PROMS/Volian.Controls.Library/DisplayApplicability.cs b/PROMS/Volian.Controls.Library/DisplayApplicability.cs
index 48b7003e..d5a06001 100644
--- a/PROMS/Volian.Controls.Library/DisplayApplicability.cs
+++ b/PROMS/Volian.Controls.Library/DisplayApplicability.cs
@@ -69,6 +69,14 @@ namespace Volian.Controls.Library
 					{
 						MyItemInfo = _MyDisplayTabItem.MyItemInfo;
 					}
+					if (MyItemInfo.IsRNOPart == true)
+					{
+						btnApplicabilitychg.Enabled = false;
+					}
+					else
+					{
+						btnApplicabilitychg.Enabled = true;
+					}
 				}
 			}
 		}
@@ -390,10 +398,18 @@ namespace Volian.Controls.Library
 						}
 					}
 				}
-				_MyItemInfo = value;
+				_MyItemInfo = value;								
 				if (_MyItemInfo != null)
 				{
 					if (this.Visible == false) return;
+					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();
 					UnwireCheckboxes(true);