diff --git a/addons/l10n_id_efaktur/models/account_move.py b/addons/l10n_id_efaktur/models/account_move.py
index d810e77a13b..61abd0b15fd 100644
--- a/addons/l10n_id_efaktur/models/account_move.py
+++ b/addons/l10n_id_efaktur/models/account_move.py
@@ -36,14 +36,10 @@ class AccountMove(models.Model):
             ('08', '08 Penyerahan yang PPN-nya Dibebaskan (Impor Barang Tertentu)'),
             ('09', '09 Penyerahan Aktiva ( Pasal 16D UU PPN )'),
         ], string='Kode Transaksi', help='Dua digit pertama nomor pajak',
-        readonly=True, states={'draft': [('readonly', False)]}, copy=False)
+        readonly=False, states={'posted': [('readonly', True)], 'cancel': [('readonly', True)]}, copy=False,
+        compute="_compute_kode_transaksi", store=True)
     l10n_id_need_kode_transaksi = fields.Boolean(compute='_compute_need_kode_transaksi')
 
-    @api.onchange('partner_id')
-    def _onchange_partner_id(self):
-        self.l10n_id_kode_transaksi = self.partner_id.l10n_id_kode_transaksi
-        return super(AccountMove, self)._onchange_partner_id()
-
     @api.onchange('l10n_id_tax_number')
     def _onchange_l10n_id_tax_number(self):
         for record in self:
@@ -55,6 +51,11 @@ class AccountMove(models.Model):
         for record in self:
             record.l10n_id_csv_created = bool(record.l10n_id_attachment_id)
 
+    @api.depends('partner_id')
+    def _compute_kode_transaksi(self):
+        for move in self:
+            move.l10n_id_kode_transaksi = move.partner_id.l10n_id_kode_transaksi
+
     @api.depends('partner_id')
     def _compute_need_kode_transaksi(self):
         for move in self: