iSupplier Portal - PO cancellation notification expiration

Hi,

Please advise the default (seeded) period before a supplier PO cancellation notification expires, and if it expires?

Example:

In iSupplier Portal, the supplier selects the Orders tab>Purchase Orders>(B) Request Cancellation and submits. The buyer receives a notification in their Home Page Worklist, opens it and selects either Accept or Reject. This notification, however, does not display a Due Date.

Can we assume that this notification will never expire? If yes, please note a formal Oracle document or a Knowledge Doc ID where this is stated, as confirmation.

Thank you,