If you already purchased our 'professional_templates' and you cant print invoice from POS, then this module will help you
The module allows you to create discount coupons and vouchers in Odoo POS. The voucher code can be used by the customer to obtain discount on orders.
The user can display the product quantities on the Odoo POS with the module. If set, The user cannot add out of stock products to the POS cart.