Fix to bug when creating suppliers on Ordering screen

prs.desktop/Panels/Stock Forecast/OrderScreen/StockForecastOrderingGrid.cs

@@ -451,7 +451,7 @@ public class StockForecastOrderingGrid : DynamicItemsListGrid<StockOrderingItem>
             var row = Data.Rows[itemIdx];
             foreach(var ac in ActionColumns)
             {
-                if(ac != QuantityColumns[supplierIdx])
+                if(supplierIdx >= QuantityColumns.Length || ac != QuantityColumns[supplierIdx])
                 {
                     UpdateCell(row, ac);
                 }