This idea has been merged into another idea. To comment or vote on this idea, please visit S1-I-280 Extra box to put a reference to what the invoice is about as well as a box for Purchase Order Numbers.
When you enter an invoice there is a 'Supplier Reference' box which suggests that you put the invoice number in it. When you open the list of invoices under a supplier the invoice number, saved as the 'Supplier Reference' is shown under a column titles 'Number'. It would be helpful if the columns/boxes were titled the same, and that the invoice numbers/'Supplier Reference' are shown on the main list. The 'Supplier Reference' isn't shown anywhere.