...
The following warning will be displayed when enabling invoices at organisation or sales channel level while no invoice document has been defined (
i.e. no document of class order invoice defined in the list of document types):
More precisely, the warning above will be displayed in following cases:
The invoicing method of an organisation is changed from never to any other mode
The invoicing method of a sales channel is changed from never to any other mode
A sales channel with an invoicing method other than never is updated (no matter which data has been updated)
A sales channel with an invoicing method other than never is re-validated (i.e. made visible again in the list of sales channels)
Getting started
...