diff --git a/PROMS/ReferencedObjects/Exe/RefObj/ROEditor/RODefFrm.cs b/PROMS/ReferencedObjects/Exe/RefObj/ROEditor/RODefFrm.cs
index 0cbd3d94..8c2a5c57 100644
--- a/PROMS/ReferencedObjects/Exe/RefObj/ROEditor/RODefFrm.cs
+++ b/PROMS/ReferencedObjects/Exe/RefObj/ROEditor/RODefFrm.cs
@@ -1542,7 +1542,7 @@ namespace ROEditor
 		//only close if they say "Yes, they want to"
 		protected override void OnFormClosing(FormClosingEventArgs e)
 		{
-			if (this.DialogResult != System.Windows.Forms.DialogResult.OK && !CloseCancel())
+			if (this.DialogResult != System.Windows.Forms.DialogResult.OK && IsPendingChange() && !CloseCancel())
 			{
 				e.Cancel = true;
 			}
@@ -1558,6 +1558,49 @@ namespace ROEditor
 
             return result == DialogResult.Yes;
         }
+
+		//return true if a field has been modified
+		private bool IsPendingChange()
+		{
+			if (origRetVal != this.tbRetVal.Text)
+				return true;
+			
+			if (origMenuItem != this.tbMenuVal.Text)
+				return true;
+
+			// check if in use records have changed
+			string inuserecs = null;
+			ROField rof;
+			for (int i = 0; i < InUseList.Count; i++)
+			{
+				rof = (ROField)InUseList[i];
+				if (rof.GetFieldname != null)   //DO YET: why null?
+				{
+					inuserecs = inuserecs + rof.GetRecID;
+					if (i + 1 < InUseList.Count) inuserecs = inuserecs + " ";
+				}
+			}
+			if (inuserecs != origFieldsInUse)
+				return true;
+
+
+			//check if applicability fields have changed
+			string applicfieldrecs = null;
+			for (int i = 0; i < InUseApplcList.Count; i++)
+			{
+				rof = (ROField)InUseApplcList[i];
+				if (rof.GetFieldname != null)
+				{
+					applicfieldrecs = applicfieldrecs + rof.GetRecID;
+					if (i + 1 < InUseApplcList.Count) applicfieldrecs = applicfieldrecs + " ";
+				}
+			}
+			if (applicfieldrecs != origApplicFields)
+				return true;
+
+			//nothing has changed
+			return false;
+		}
 		#endregion
 	}
 }