YII 1.1嵌套模块不工作

I have faced the problem for conflict the routes in YII 1.1. Parent and child module have the same name. but actual URL is Different.

File Structure

+ modules
 + module1
  + controller
   ...
   + modules
    + module2
      + controller
       ...
 + module2
  + controller
  ...

Config/Main.php

'module1'=>array('modules'=>array('module2')),
'module2',

route

1) http://XXX:8000/index.php/module1/default/index
2) http://XXX:8000/index.php/module2/default/index
3) http://XXX:8000/index.php/module1/module2/default/index

3rd URL roted to URL 2.

When i called module1 or module2 controllers it's work fine. but i called module1/module2 controller it's routes to base module 'module2'.

my URLManager

'urlManager'=>array(
    'urlFormat'=>'path',
    'rules'=>array(
        '<controller:\w+>/<id:\d+>'=>'<controller>/view',
        '<controller:\w+>/<action:\w+>/<id:\d+>'=>'<controller>/<action>',
        '<controller:\w+>/<action:\w+>'=>'<controller>/<action>',
    ),
),

Thanks in advance.