[FIX] account: Register payment with several bills

When a payment is created for a bill, this is always the 'commercial_partner_id'
which is used as 'partner_id'.
Then:
-When registering a payment with several bills, the 'commercial_partner_id'
field of these bills must be the same.

-When grouping bills by partner, the groups must contain all the bills from
the same 'commercial_partner_id'.

opw:653005

addons/account/models/account_payment.py

@@ -120,8 +120,8 @@ class account_register_payments(models.TransientModel):
         invoices = self.env[active_model].browse(active_ids)
         if any(invoice.state != 'open' for invoice in invoices):
             raise UserError(_("You can only register payments for open invoices"))
-        if any(inv.partner_id != invoices[0].partner_id for inv in invoices):
-            raise UserError(_("In order to pay multiple invoices at once, they must belong to the same partner."))
+        if any(inv.commercial_partner_id != invoices[0].commercial_partner_id for inv in invoices):
+            raise UserError(_("In order to pay multiple invoices at once, they must belong to the same commercial partner."))
         if any(MAP_INVOICE_TYPE_PARTNER_TYPE[inv.type] != MAP_INVOICE_TYPE_PARTNER_TYPE[invoices[0].type] for inv in invoices):
             raise UserError(_("You cannot mix customer invoices and vendor bills in a single payment."))
         if any(inv.currency_id != invoices[0].currency_id for inv in invoices):
@@ -132,7 +132,7 @@ class account_register_payments(models.TransientModel):
             'amount': abs(total_amount),
             'currency_id': invoices[0].currency_id.id,
             'payment_type': total_amount > 0 and 'inbound' or 'outbound',
-            'partner_id': invoices[0].partner_id.id,
+            'partner_id': invoices[0].commercial_partner_id.id,
             'partner_type': MAP_INVOICE_TYPE_PARTNER_TYPE[invoices[0].type],
         })
         return rec

addons/account/views/account_invoice_view.xml

@@ -516,7 +516,7 @@
                     <separator/>
                     <filter domain="[('user_id','=',uid)]" help="My Invoices"/>
                     <group expand="0" string="Group By">
-                        <filter name="group_by_partner_id" string="Partner" context="{'group_by':'partner_id'}"/>
+                        <filter name="group_by_partner_id" string="Partner" context="{'group_by':'commercial_partner_id'}"/>
                         <filter string="Salesperson" context="{'group_by':'user_id'}"/>
                         <filter name="status" string="Status" context="{'group_by':'state'}"/>
                         <separator/>