Currently the eCommerce workflow in Ecuador lacks some information
needed to issue EDI invoices.
The main adaptions needed are:
* Identification type and number in the checkout process (in the billing address)
* SRI Payment Method in the eCommerce Payment Method
SRI Payment Method
* The SRI Payment Method value is required for the EDI
* In the payment method form view the SRI Payment Method field is hidden
if the list of fiscal countries of the selected companies does not include Ecuador.
* Payment methods which do not have an associated SRI Payment Method
cannot be used in the eCommerce checkout of an Ecuadorian company.
* A (default) SRI Payment Method has been addeded to some payment methods to simplify the setup.
* When creating an invoice from a sales order we try to compute the SRI Payment Method as follows:
We consider all the SRI Payment Methods of the payment methods of the payment transactions associated with the sales order.
If there is exactly 1 such SRI Payment Method we use this on the invoice.
This should ensures that we can always set the SRI Payment Method on invoices created through the eCommerce flow.
task-3585823
Part-of: odoo/odoo#142730
