[fix] resource booking different company

models/calendar_event.py

@@ -15,18 +15,18 @@ class ScopResourceEvent(models.Model):
     def _check_resource_already_used(self):
         for record in self:
             if record.scop_resource_id:
-                resource_check = self.env['calendar.event'].search([
+                resource_check = self.env['calendar.event'].sudo().search([
                     ('id', '!=', record.id),
                     ('start', '<', record.stop),
                     ('stop', '>', record.start),
-                    ('scop_resource_id', '=', record.scop_resource_id.id)
+                    ('scop_resource_id', '=', record.scop_resource_id.id),
                 ])
                 if resource_check:
                     raise ValidationError(
                         _(
                             "La ressource %s n'est pas disponible",
                         )
-                        % record.scop_resource_id.name,
+                        % record.sudo().scop_resource_id.name,
                     )
 
     # ------------------------------------------------------