fix test run issue

app/Models/PurchaseOrderModel.php

@@ -3,18 +3,22 @@
 namespace App\Models;
 
 use CodeIgniter\Model;
+use App\Models\Concerns\SchoolYearAutoFillTrait;
 
 class PurchaseOrderModel extends Model
 {
+    use SchoolYearAutoFillTrait;
+
     protected $table          = 'purchase_orders';
     protected $primaryKey     = 'id';
-    protected $allowedFields  = ['po_number','supplier_id','status','order_date','expected_date','subtotal','tax','total','notes'];
+    protected $allowedFields  = ['po_number','supplier_id','status','school_year','order_date','expected_date','subtotal','tax','total','notes'];
     protected $useTimestamps  = true;
     protected $useSoftDeletes = true;
 
     protected $validationRules = [
         'po_number'   => 'required|max_length[60]|is_unique[purchase_orders.po_number,id,{id}]',
         'supplier_id' => 'required|is_natural_no_zero',
+        'school_year' => 'required|string|max_length[9]',
         'status'      => 'in_list[draft,ordered,received,canceled]',
     ];
 }