diff --git a/TBF/Rig/DataEntry/S620/EntryForm.cs b/TBF/Rig/DataEntry/S620/EntryForm.cs
index 370888f66..f818120c3 100644
--- a/TBF/Rig/DataEntry/S620/EntryForm.cs
+++ b/TBF/Rig/DataEntry/S620/EntryForm.cs
@@ -178,8 +178,8 @@ namespace TBF.Rig.DataEntry.S620
         {
             if (entryFormCfg.ProductionTracing)
             {
-                string order = ProcessData.SelectedProcedure.OrderInfo.POName;
-                string workflow = ProcessData.SelectedProcedure.Workflow;
+                string order = (ProcessData.OrderInfo != null) ? ProcessData.OrderInfo.POName : string.Empty;
+                string workflow = (ProcessData.Workflow != null) ? ProcessData.Workflow.Name : string.Empty;
 
                 myRef.modelessDlg = new FormForMechanicalMetersWithTracing(waterMeters, entryFormCfg.MaxWMsCount, entryFormCfg.CloseButton, true,
                                                                            true, entryFormCfg.OrdersFromProdTracing, order, workflow);
diff --git a/TBF/Rig/DataEntry/S620/FormForMechanicalMetersWithTracing.cs b/TBF/Rig/DataEntry/S620/FormForMechanicalMetersWithTracing.cs
index 654816924..804c58ed3 100644
--- a/TBF/Rig/DataEntry/S620/FormForMechanicalMetersWithTracing.cs
+++ b/TBF/Rig/DataEntry/S620/FormForMechanicalMetersWithTracing.cs
@@ -414,19 +414,24 @@ namespace TBF.Rig.DataEntry.S620
         /// <summary>
         /// Assign serial numbers
         /// </summary>
-        /// <returns>true = s/n-s are assigned, false = order information or DB connection</returns>
+        /// <returns>true = s/n-s are assigned, false = no order information or DB connection</returns>
         bool AssignSerialNumbers()
         {
-            assignedSNs.Clear();
-
             var order = ProcessData.OrderInfo;
-            ///
+
+            if (order == null)
+            {
+                return false;   /// No order information available
+            }
+
             var oraOrder = order as TBF.Rig.Output.DB.SensusOracle.OrderDetails;
             if (oraOrder != null && (ProcessData.OracleDB == null || !ProcessData.OracleDB.ReadOrderDetails(ref oraOrder)))
             {
                 return false;   /// Oracle order details could not be loaded
             }
 
+            assignedSNs.Clear();
+
             lastProducedPcsCount = order.CurrentPcsCount;
             lastAssignedSN = order.CurrentSN;