Add back2draft on SEPA Direct Debit mandates (in case it was cancelled by mistake).

account_banking_sepa_direct_debit/account_banking_sdd.py

@@ -314,6 +314,16 @@ class sdd_mandate(orm.Model):
             cr, uid, to_cancel_ids, {'state': 'cancel'}, context=context)
         return True
 
+    def back2draft(self, cr, uid, ids, context=None):
+        to_draft_ids = []
+        for mandate in self.browse(cr, uid, ids, context=context):
+            assert mandate.state == 'cancel',\
+                'Mandate should be in cancel state'
+            to_draft_ids.append(mandate.id)
+        self.write(
+            cr, uid, to_draft_ids, {'state': 'draft'}, context=context)
+        return True
+
     def _sdd_mandate_set_state_to_expired(self, cr, uid, context=None):
         logger.info('Searching for SDD Mandates that must be set to Expired')
         expire_limit_date = datetime.today() + \

account_banking_sepa_direct_debit/sdd_mandate_view.xml

@@ -13,8 +13,11 @@
     <field name="arch" type="xml">
         <form string="SEPA Direct Debit Mandate" version="7.0">
             <header>
-                <button name="validate" type="object" string="Validate" states="draft"/>
+                <button name="validate" type="object" string="Validate" states="draft" class="oe_highlight"/>
                 <button name="cancel" type="object" string="Cancel" states="draft,valid"/>
+                <button name="back2draft" type="object" string="Back to Draft"
+                    states="cancel" groups="account.group_account_manager"
+                    confirm="You should set a mandate back to draft only if you cancelled it by mistake. Do you want to continue ?"/>
                 <field name="state" widget="statusbar"/>
             </header>
             <sheet>