My change order is stuck in Ordering status in Ariba Buying and Invoicing (P2P) with the error below in the History tab, followed by an ANERR number:

Error:Can not update order for a different supplier

How can this be resolved?

This error can be caused by the reasons below:

1. The supplier's SAP Business Network ID (ANID) changed between versions of the PO.
2. If the supplier is configured for email orders, this issue can be caused by the PrivateID changing between versions of the PO.
3. The Legacy Vendor ID (if email supplier) for this vendor was changed or deleted in the Buyer's SAP Business Network account after the original PO was sent to the SAP Business Network.

In order to resolve the issue, you must verify that the supplier data is correct in Buying & Invoicing and in the SAP Business Network. Once the data is verified, Force Order the order and recreate the order in a new Purchase Requisition.

You can see the supplier ANID the original PO version was sent to by reviewing the cXML in SAP Business Network (buyer).

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