NIW, PD 3/27/2006, I485 RD 7/2/2007, ND 7/27/2007. Today, I checked the online status and found the following information:
On September 3, 2008, we mailed a notice requesting additional evidence or information in this case I485 APPLICATION TO REGISTER PERMANENT RESIDENCE OR TO ADJUST STATUS. Please follow the instructions on the notice to submit the requested information. This case will be in suspense until we receive the evidence or the opportunity to submit it expires. Once we receive the requested evidence or information and make a decision on the case, you will be notified by mail. If you move while this case is pending, call 1-800-375-5283 to update your address.
What is the REF? Any replay is appreciate.