Invoice Number (reference number) disappear in "payment history" report

Invoice Number (reference number) disappear in "payment history" report

urgent! we found that the "invoice number" column for "payment history" is missing starting this or past month... Previous month february2012, when we exported "payment history" to csv format and the "invoice number" column is still there. Now it's disappeared. We really need the invoice number to track the invoice record. Our reason is, one client could have many invoices, if the "invoice number" column being deleted, means we have to click the "customer name" to jump to another page to check. Also it's pointless to save a csv copy since all the payment records are without invoice number!!

Please, can you change back old version?