Added validation for POIA's not allowed to match the POI job.

prs.desktop/Panels/PurchaseOrders/SupplierPurchaseOrderItemOneToMany.cs

@@ -166,6 +166,18 @@ public class SupplierPurchaseOrderItemOneToMany : DynamicOneToManyGrid<PurchaseO
         Allocations.RemoveAll(x => !Items.Contains(x.Item1));
     }
 
+    protected override void DoValidate(PurchaseOrderItem[] items, List<string> errors)
+    {
+        base.DoValidate(items, errors);
+        foreach(var item in items)
+        {
+            if(Allocations.Any(x => x.Item1 == item && x.Item2.JobRequisitionItem.ID == Guid.Empty && x.Item2.Job.ID == item.Job.ID))
+            {
+                errors.Add("At least one allocation on this purchase order item is invalid due to having the same [Job] as the purchase order item.");
+            }
+        }
+    }
+
     public override void AfterSave(object item)
     {
         base.AfterSave(item);