[add] change partner payment mode from mandate

models/account_banking_mandate.py

 # © 2020 Le Filament (<http://www.le-filament.com>)
 # License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
 
-from odoo import models
+from odoo import _, models
+from odoo.exceptions import UserError
 
 
 class AccountBankingMandate(models.Model):
@@ -10,6 +11,15 @@ class AccountBankingMandate(models.Model):
     # ------------------------------------------------------
     # Button functions
     # ------------------------------------------------------
+    def set_payment_order(self):
+        self.ensure_one()
+        payment_mode = self.env["account.payment.mode"].search(
+            [("payment_method_id.code", "=", "sepa_direct_debit")]
+        )
+        if not payment_mode:
+            raise UserError(_("Aucun mode de prélèvement SEPA configuré."))
+        self.partner_id.customer_payment_mode_id = payment_mode
+
     def set_invoice_mandate(self):
         return {
             "name": "Affectation du nouveau mandat",
@@ -42,6 +52,8 @@ class AccountBankingMandate(models.Model):
         payment_mode = self.env["account.payment.mode"].search(
             [("payment_method_id.code", "=", "sepa_direct_debit")]
         )
+        if not payment_mode:
+            raise UserError(_("Aucun mode de prélèvement SEPA configuré."))
         invoice.update(
             {
                 "payment_mode_id": payment_mode.id,

views/account_banking_mandate.xml

@@ -12,10 +12,19 @@
             <field name="arch" type="xml">
                 <xpath expr="//group[@name='main']" position="before">
                     <div class="col-12 mt16 mb16" name="change_mandate_button">
+                        <button
+                            name="set_payment_order"
+                            type="object"
+                            class="btn-outline-info"
+                            string="Affecter le prélèvement comme mode de paiement par défaut"
+                            attrs="{'invisible': [('state', '!=', 'valid')]}"
+                            confirm="Valider le prélèvement par défaut pour la coopérative ?"
+                        />
                         <button
                             name="set_invoice_mandate"
                             type="object"
                             class="btn-outline-info"
+                            style="margin-left: 15px;"
                             string="Affecter ce mandat aux factures ouvertes"
                             attrs="{'invisible': [('state', '!=', 'valid')]}"
                         />