[IMP] rma: Add customer as suggested recipient

rma/models/rma.py

@@ -2,7 +2,7 @@
 # License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl).
 
 from odoo import _, api, fields, models
-from odoo.exceptions import ValidationError
+from odoo.exceptions import AccessError, ValidationError
 from odoo.tests import Form
 from odoo.tools import html2plaintext
 import odoo.addons.decimal_precision as dp
@@ -1147,6 +1147,17 @@ class Rma(models.Model):
         self_with_context = self.with_context(mail_post_autofollow=True)
         return super(Rma, self_with_context).message_post(**kwargs)
 
+    @api.multi
+    def message_get_suggested_recipients(self):
+        recipients = super().message_get_suggested_recipients()
+        try:
+            for record in self.filtered("partner_id"):
+                record._message_add_suggested_recipient(
+                    recipients, partner=record.partner_id, reason=_('Customer'))
+        except AccessError:  # no read access rights
+            pass
+        return recipients
+
     # Reporting business methods
     def _get_report_base_filename(self):
         self.ensure_one()