diff --git a/app/Models/CharacteristicApproverMaster.php b/app/Models/CharacteristicApproverMaster.php
index 77020bd..e9db90f 100644
--- a/app/Models/CharacteristicApproverMaster.php
+++ b/app/Models/CharacteristicApproverMaster.php
@@ -15,6 +15,7 @@ class CharacteristicApproverMaster extends Model
         'machine_id',
         'machine_name',
         'characteristic_field',
+        'approver_type',
         'name1',
         'mail1',
         'name2',