Xiaobaitu and pjiang, different A# on _485 receipt from I-140

my I-140 was approved in June, 2007. Filed I-485 on July 2. Got receipt already. But A# on I-485 is different from I-140. That means I have two different A#. Is this a problem? I call my attorney. He said it's ok. Do I need to ask CIS to make correction? Thanks!