FBL5N Review Open and Cleared Invoices per Customer

WHen one of our users goes into FBL5N to review open and cleared invoices he adds the WBS and the Profit Center. When the report runs it is blank. I looked at the invoice itself and the WBS and Profit center is on the invoice but I don't know why it doesn't show up on the report. Can anyone tell me why this happens? Do I need to make any kind of adjustment before running the report?

Thanks