[BUG][12.0] pos_wechat

[em230418]

1. Deploy demo database
2. Loing as admin/admin
3. Install pos_wechat
4. Enter the POS
5. Choose products and make payment
6. Choose Wechat native payment

Odoo Server Error - Access Error
Sorry, you are not allowed to create this kind of document. Please contact your system administrator if you think this is an error.

(Document model: wechat.order) - (Operation: create, User: 2)