Why does my purchase order have an order status of Obsoleted?
If your purchase order has a status of Obsoleted, that means your customer has likely created a new version of the order. To locate the new version, you can search by purchase order number. This will display all versions of the order. The version with an order status of Changed is the one you will have to work with.
If your customer has not sent you a new version of the order, then you should contact them.
SAP Business Network for Procurement & Supply Chain > Transaction Documents > Transaction (Purchase Orders, Ship Notices & Goods Receipts)