diff --git a/PROMS/Volian.Controls.Library/DisplaySearch.Designer.cs b/PROMS/Volian.Controls.Library/DisplaySearch.Designer.cs
index c084ced5..97ce6ee1 100644
--- a/PROMS/Volian.Controls.Library/DisplaySearch.Designer.cs
+++ b/PROMS/Volian.Controls.Library/DisplaySearch.Designer.cs
@@ -1270,6 +1270,7 @@ namespace Volian.Controls.Library
 			this.grpPanSearchResults.Margin = new System.Windows.Forms.Padding(3, 2, 3, 2);
 			this.grpPanSearchResults.Name = "grpPanSearchResults";
 			this.grpPanSearchResults.Size = new System.Drawing.Size(369, 268);
+			this.grpPanSearchResults.MouseDown += GrpPanSearchResults_MouseDown;
 			// 
 			// 
 			// 
@@ -1688,6 +1689,7 @@ namespace Volian.Controls.Library
 
         }
 
+		
 		#endregion
 
 		private DevComponents.DotNetBar.TabControl tabSearchTypes;
diff --git a/PROMS/Volian.Controls.Library/DisplaySearch.cs b/PROMS/Volian.Controls.Library/DisplaySearch.cs
index 1cff8eed..3f2c409a 100644
--- a/PROMS/Volian.Controls.Library/DisplaySearch.cs
+++ b/PROMS/Volian.Controls.Library/DisplaySearch.cs
@@ -1220,19 +1220,35 @@ namespace Volian.Controls.Library
 			didcheck = false;
 			JustDidSelection = false;
 		}
+		private void GrpPanSearchResults_MouseDown(object sender, System.Windows.Forms.MouseEventArgs e)
+		{
+			// B2021-004: If a multiple selection occurred in the results list for Incoming Transitions, tell user that
+			//	processing is occurring
+			if (!lbSrchResultsIncTrans.Enabled) FlexibleMessageBox.Show("Processing a request to open a procedure. Try again when complete.",
+				"Try Again", MessageBoxButtons.OK, MessageBoxIcon.Information);
+		}
 		private bool _ProcessingSelectedValueChanged = false;
 		private void lbSrchResults_SelectedValueChanged(object sender, EventArgs e)
 		{
 			if (_LoadingList) return;
 			if (_ProcessingSelectedValueChanged) return;
 			_ProcessingSelectedValueChanged = true;
+			// B2021-004: Prevent multiple selections on the Incoming Transitions listbox  (disable selections
+			//	for the listbox until all processing is done, listbox is enabled at end of method)
+			if (tabSearchTypes.SelectedTab == tabSearchTypes.Tabs[4])
+			{
+				lbSrchResultsIncTrans.Enabled = false;
+				lbSrchResultsIncTrans.UseWaitCursor = true;
+			}
 			JustDidSelection = true;
+			ListBox mylb = sender as ListBox;
+
 			// If the list is being refreshed, then set the selection index to -1 (no selection)
-			if (_SearchResults.RefreshingList && lbSrchResults.SelectedIndex != -1)
-				lbSrchResultsIncTrans.SelectedIndex = lbSrchResults.SelectedIndex = -1;
+			if (mylb != null && _SearchResults.RefreshingList && mylb.SelectedIndex != -1)
+				mylb.SelectedIndex = -1;
 			else
 			{
-				_ItemInfo = (tabSearchTypes.SelectedTab == tabSearchTypes.Tabs[4])? lbSrchResultsIncTrans.SelectedValue as ItemInfo : lbSrchResults.SelectedValue as ItemInfo;
+				_ItemInfo = (tabSearchTypes.SelectedTab == tabSearchTypes.Tabs[4]) ? lbSrchResultsIncTrans.SelectedValue as ItemInfo : lbSrchResults.SelectedValue as ItemInfo;
 				if ((tabSearchTypes.SelectedTab == tabSearchTypes.Tabs[1]) && (_ItemInfo != null))
 				{
 					// B2020-019: Don't set the CurrentAnnotation to an annotation in a procedure that cannot be opened.
@@ -1263,6 +1279,11 @@ namespace Volian.Controls.Library
 				}
 			}
 			_ProcessingSelectedValueChanged = false;
+			if (tabSearchTypes.SelectedTab == tabSearchTypes.Tabs[4])
+			{
+				lbSrchResultsIncTrans.Enabled = true;
+				lbSrchResultsIncTrans.UseWaitCursor = false;
+			}
 		}
 
 		private void cmbResultsStyle_SelectedValueChanged(object sender, EventArgs e)