[fix] error invoice access on period change

models/scop_period.py

@@ -102,5 +102,6 @@ class ScopPeriod(models.Model):
                 partner_vals.pop('end', False)
 
                 # Update partner
-                period.partner_id.write(partner_vals)
+                period.partner_id.sudo().write(partner_vals)
+
         return super(ScopPeriod, self).write(vals)