diff --git a/PROMS/VEPROMS User Interface/frmVEPROMS.cs b/PROMS/VEPROMS User Interface/frmVEPROMS.cs
index 4d2bb708..986c3b02 100644
--- a/PROMS/VEPROMS User Interface/frmVEPROMS.cs	
+++ b/PROMS/VEPROMS User Interface/frmVEPROMS.cs	
@@ -1033,13 +1033,20 @@ namespace VEPROMS
 				if (myDTI.MyDSOTabPanel != null)
 				{
 					DSOTabPanel myDTP = myDTI.MyDSOTabPanel;
-					SelectedROFst = myDTP.MyDisplayTabItem.MyItemInfo.MyDocVersion.DocVersionAssociations[0].MyROFst;
-					if (_LastROFSTID != SelectedROFst.ROFstID) // B2017-240 Only refresh when the ROFSTID is different
+					if (myDTP.MyDisplayTabItem.MyItemInfo.MyDocVersion.DocVersionAssociations == null)
 					{
-						_LastROFSTID = SelectedROFst.ROFstID;
-						displayRO.MyROFST = SelectedROFst;		// need this to update RO Tree after UpdateRofst (B2015-226)
-						displayRO.MyROFSTLookup = SelectedROFst.GetROFSTLookup(SelectedDVI);
-						displayRO.RefreshRoTree();
+						SelectedROFst = null; // B2020-071 ROs are not associated with this procedure set. Set value to null so that PROMS does not try to generate the RO tree in Step Properties.
+					}
+					else
+					{
+						SelectedROFst = myDTP.MyDisplayTabItem.MyItemInfo.MyDocVersion.DocVersionAssociations[0].MyROFst;
+						if (_LastROFSTID != SelectedROFst.ROFstID) // B2017-240 Only refresh when the ROFSTID is different
+						{
+							_LastROFSTID = SelectedROFst.ROFstID;
+							displayRO.MyROFST = SelectedROFst;		// need this to update RO Tree after UpdateRofst (B2015-226)
+							displayRO.MyROFSTLookup = SelectedROFst.GetROFSTLookup(SelectedDVI);
+							displayRO.RefreshRoTree();
+						}
 					}
 				}
 				else if (tc.MyEditItem != null && displayRO.MyROFST != null && tc.MyEditItem.MyItemInfo.MyDocVersion.DocVersionAssociations[0].ROFstID != displayRO.MyROFST.ROFstID)