I think it would be immensely helpful to add a column for Purchase Order to the Customer Invoices, Stats, Etc screen, so the columns would read Inv #, PO, Date, Amount, Status. This would make it similar to the Suppliers Purchases & Stats screen, with PO substituted for the Ref column. This way I could see Purchase Orders at a glance, without having to go into the specific invoice. There seems to be plenty of room for it and it would save me a lot of time!