Odoo 9.0 Enterprise Edition
eCommerce implementation with Ogone integration

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After confirmation, in the backend system we see the quotation is automatically converted to a sales order with payment.

When we create an invoice on the sales order, the invoice gets state open and not the status paid. Why?
The customer already paid for his order, why we need to register again a payment on the invoice.

Is there a way to link the payment of the sales order to the generated invoice?