Topic: ORDER BY trans.trans_no desc
in file - sales/includeds/db/cust_trans_db.inc - line 359 should be by default
$sql .= " GROUP BY trans.trans_no, trans.type ORDER BY trans.trans_no desc";
otherwise is redundant to constantly order types by desc since in most business recent customers have the most questions... so it should be displayed as recent invoices/payments/credits first.
...perhaps more of a suggestion than a bug