Invoices should be paid as soon as possible after the invoice date.  Before an invoice is paid, all items listed on an invoice should be verified by the Bookkeeper.  If further clarification of an invoice is needed, then the Senior Serials Assistant and the Acquisitions Assistant should assist the Bookkeeper in verifying the invoice.  The Acquisitions/Serials Librarian should be consulted about any unresolved problems encountered in the paying of the invoice.