add partner constrain

rma/models/rma_order.py

@@ -2,7 +2,8 @@
 # © 2017 Eficent Business and IT Consulting Services S.L.
 # License LGPL-3.0 or later (https://www.gnu.org/licenses/lgpl.html)
 
-from openerp import api, fields, models
+from openerp import api, fields, models, _
+from openerp.exceptions import UserError
 from datetime import datetime
 
 
@@ -72,6 +73,16 @@ class RmaOrder(models.Model):
                                  required=True, default=lambda self:
                                  self.env.user.company_id)
 
+    @api.constrains("partner_id", "rma_line_ids")
+    def _check_partner_id(self):
+        if self.rma_line_ids and self.partner_id != self.mapped(
+                "rma_line_ids.partner_id"):
+            raise UserError(_(
+                "Group partner and RMA's partner must be the same."))
+        if len(self.mapped("rma_line_ids.partner_id")) > 1:
+            raise UserError(_(
+                "All grouped RMA's should have same partner."))
+
     @api.model
     def create(self, vals):
         if (self.env.context.get('supplier') or