diff --git a/trytond/trytond/trytond/pool.py b/trytond/trytond/pool.py
index 8d8d2f28..3349d6a1 100644
--- a/trytond/trytond/pool.py
+++ b/trytond/trytond/pool.py
@@ -184,6 +184,13 @@ class Pool(object):
                 cls = builtins.type(str(name), (Report,), {})
                 cls.__setup__()
                 self.add(cls, type)
+                for mixins in self.classes_mixin.values():
+                    for parent, mixin in mixins:
+                        if (not issubclass(cls, parent) or issubclass(cls, mixin)):
+                            continue
+                        cls = builtins.type(cls.__name__, (mixin, cls), {})
+                        self.add(cls, type=type)
+                cls = self._pool[self.database_name][type][name]
                 return cls
             elif name[:15] == 'babi_execution_':
                 with Transaction(new=True).start(self.database_name, 0, readonly=False):