diff --git a/PROMS/VEPROMS.CSLA.Library/Extension/ItemExt.cs b/PROMS/VEPROMS.CSLA.Library/Extension/ItemExt.cs
index 3f40942c..9b839067 100644
--- a/PROMS/VEPROMS.CSLA.Library/Extension/ItemExt.cs
+++ b/PROMS/VEPROMS.CSLA.Library/Extension/ItemExt.cs
@@ -2263,6 +2263,7 @@ namespace VEPROMS.CSLA.Library
 				if (sc.MyEnhancedDocuments != null && sc.MyEnhancedDocuments.Count == 1 && sc.MyEnhancedDocuments[0].Type == 0)
 				{
 					SectionInfo siSource = SectionInfo.Get(sc.MyEnhancedDocuments[0].ItemID);
+					if (siSource == null) return true; //B2018-142 null check to allow deletion of unlinked background procedure
 					SectionConfig scs = siSource.MyConfig as SectionConfig;
 					if (scs.Section_LnkEnh == "T") return true;
 				}
@@ -3886,6 +3887,8 @@ namespace VEPROMS.CSLA.Library
 				{
 					string tb = (LinkedOrdinal==null)? "NA" : LinkedOrdinal.ToString();
 					tbformat = tbformat.Replace("{LNK C/N Num}", tb);
+					if ((ActiveParent as ItemInfo).FormatStepData.TabData.IdentEdit.Contains("{Section Prefix}"))
+						tbformat = tbformat.Replace("{Section Prefix}",""); // B2018-141  remove duplicate section number
 					if ((ActiveParent as ItemInfo).LinkedTab != null)
 					tbformat = tbformat.Replace("{LNK Step Num}", (ActiveParent as ItemInfo).LinkedTab.Trim(" .".ToCharArray())); //(ActiveParent as ItemInfo).Ordinal.ToString());
 					tbformat = tbformat.TrimStart(" ".ToCharArray());
@@ -7039,6 +7042,7 @@ namespace VEPROMS.CSLA.Library
 			// now get its enhtype from the source:
 			int enhtype = -1;
 			ItemInfo sourceProc = ItemInfo.Get(eds[0].ItemID);
+			if (sourceProc == null) return null; //B2018-142 to allow an un-linked background procedure to be deleted
 			EnhancedDocuments sourceProcEds = sourceProc.GetMyEnhancedDocuments();
 			foreach (EnhancedDocument spe in sourceProcEds)
 			{