Fix to loading correct columns in recalculation of stock holding

prs.desktop/Panels/Products/Locations/StockHoldingGrid.cs

@@ -122,6 +122,8 @@ public class StockHoldingGrid : DynamicDataGrid<StockHolding>
                     .Add(x => x.AverageValue)            
                     .Add(x => x.Available)            
                     .Add(x => x.Qty)
+                    .Add(x => x.Weight)
+                    .Add(x => x.Value)
             );
             
             query.Add(