If you use Receiver Matching View, you can select the invoices using the combination of Year, Daybook and Voucher number. When you click search, the system will return any receiver matching records associated with the invoice(s) selected. You can double-click on each record to open the form for the Receiver Matching record, or right click and select View. You should then see the header details and a grid with the matching details. There should be columns available named "Internal Ref" and "Ext Ref". The Internal Ref column should show the receiver number for the receipt. If packing slip numbers were recorded during the receiving process, then they should display in the "Ext Ref" column. If either of these columns are not displayed by default, then you can right click in the grid, select the "Columns..." option, and add these columns to the display.