Fixed infinite task waiting in POItemStore

prs.stores/PurchaseOrderItemStore.cs

@@ -102,6 +102,7 @@ namespace Comal.Stores
                     )
                 ).Rows.FirstOrDefault();
             });
+            instancetask.Start();
             
             var producttask = new Task<CoreRow?>(() =>
             {
@@ -143,7 +144,7 @@ namespace Comal.Stores
             });
             locationtask.Start();
 
-            Task.WaitAll(movementtask, producttask, locationtask);
+            Task.WaitAll(movementtask, producttask, locationtask, instancetask);
 
             var movements = movementtask.Result;
             var instancerow = instancetask.Result;