What happens if the requester doesn't respond to a Confirm Receipts workflow notification?

When a notification is sent, it's up to the requester to act on it manually. Notifications by default have an expiration date of 1 week, after which the notification escalates to the line manager of the requester. After 1 week of escalation, the notification expires.

When a notification expires, the purchase order becomes eligible for the Confirm Receipt workflow again. And if still not received, the purchase order requester is sent another notification.