Records with active workflow cannot be deleted

trytond/osv/orm.py

@@ -1259,6 +1259,14 @@ class ORM(object):
         self.pool.get('ir.model.access').check(cursor, user, self._name,
                 'unlink')
 
+        cursor.execute("SELECT id FROM wkf_instance "\
+                       "WHERE res_id IN ("+",".join(["%s" for i in ids])+") "\
+                       "AND res_type = %s AND state != 'complete'",
+                       (ids+[self._name]))
+        if cursor.rowcount != 0:
+            raise ExceptORM(
+                'UserError','You cannot delete a record with a running workflow.')
+
         wf_service = LocalService("workflow")
         for obj_id in ids:
             wf_service.trg_delete(user, self._name, obj_id, cursor)