diff --git a/PROMS/Volian.Controls.Library/DisplayApplicability.Designer.cs b/PROMS/Volian.Controls.Library/DisplayApplicability.Designer.cs
index cc37fbea..cffdd423 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 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;
@@ -175,3 +175,4 @@ namespace Volian.Controls.Library
 
 	}
 }
+
diff --git a/PROMS/Volian.Controls.Library/DisplayApplicability.cs b/PROMS/Volian.Controls.Library/DisplayApplicability.cs
index 48b7003e..77342c37 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);
@@ -500,3 +516,4 @@ namespace Volian.Controls.Library
 		}
 	}
 }
+