Update Supplier Terms for all Suppliers or Invoices (EBS 12.1)

Hi,

We have a requirement that all invoices should now be paid immediately once approved, rather than as per the supplier terms. Is there a facility for doing a bulk update of all supplier payment terms? Or, is it possible to override so that each newly entered invoice automatically defaults to immediate rather than the supplier terms?

Under the Payables System Setup, on the Supplier Tab there is the option to set default payment terms - but is that just used as a default for when new suppliers are set up, or is it an override?

Thanks in advance.