diff --git a/trytond/trytond/pool.py b/trytond/trytond/pool.py
index 407ff358..0be2a41a 100644
--- a/trytond/trytond/pool.py
+++ b/trytond/trytond/pool.py
@@ -195,6 +195,16 @@ class Pool(object):
                 self.add(cls, type)
                 self.setup_mixin(self._modules, type='report', name=name)
                 return self.get(name, type=type)
+            elif name[:15] == 'babi_execution_':
+                import sys
+                # Do not reload if babi model is accessed during update.
+                if not sys.argv[0].endswith('trytond-admin'):
+                    with Transaction(new=True).start(self.database_name, 0,
+                            readonly=False):
+                        Execution = self.get('babi.report.execution')
+                        execution = Execution(int(name[15:]))
+                        execution.validate_model(avoid_registration=True)
+                    return self._pool[self.database_name][type][name]
             raise
 
     def add(self, cls, type='model'):
diff --git a/trytond/trytond/model/modelsql.py b/trytond/trytond/model/modelsql.py
index d762a27a..5ca47c34 100644
--- a/trytond/trytond/model/modelsql.py
+++ b/trytond/trytond/model/modelsql.py
@@ -1127,8 +1127,14 @@ class ModelSQL(ModelStorage):
                 foreign_table = Model.__table__()
                 foreign_red_sql = reduce_ids(
                     Column(foreign_table, field_name), sub_ids)
-                cursor.execute(*foreign_table.select(foreign_table.id,
-                        where=foreign_red_sql))
+                import psycopg2
+                try:
+                    cursor.execute(*foreign_table.select(foreign_table.id,
+                            where=foreign_red_sql))
+                except psycopg2.errors.UndefinedTable as ex:
+                    if ex.args and 'babi_execution' in ex.args:
+                        return []
+                    raise
                 records = Model.browse([x[0] for x in cursor])
             else:
                 with transaction.set_context(active_test=False):