How do I delete a purchase order (PO)?

While documents on Ariba cannot be deleted, you can hide purchase orders, or reject them if you won't fulfill the order.

Once a document is submitted in Ariba, it cannot be deleted. This is true for all types of documents (POs, invoices, confirmations, ship notices, service sheets, ect).

SAP Business Network for Procurement & Supply Chain > Transaction Documents > Transaction (Purchase Orders, Ship Notices & Goods Receipts)