diff --git a/addons/account/wizard/account_tour_upload_bill.py b/addons/account/wizard/account_tour_upload_bill.py
index fdfac251cbc..4c0209d370f 100644
--- a/addons/account/wizard/account_tour_upload_bill.py
+++ b/addons/account/wizard/account_tour_upload_bill.py
@@ -8,9 +8,11 @@ import base64
 class AccountTourUploadBill(models.TransientModel):
     _name = 'account.tour.upload.bill'
     _description = 'Account tour upload bill'
-    _inherits = {'mail.compose.message': 'composer_id'}
 
-    composer_id = fields.Many2one('mail.compose.message', string='Composer', required=True, ondelete='cascade')
+    attachment_ids = fields.Many2many(
+        comodel_name='ir.attachment',
+        relation='account_tour_upload_bill_ir_attachments_rel',
+        string='Attachments')
 
     selection = fields.Selection(
         selection=lambda self: self._selection_values(),