3187194 - PO stuck in ordering after change adding new items with error code CIG-PLT-04641

There's a Purchase Requisition (PR) that generates a Purchase Order (PO) after fully approved which become stuck in "Ordering" status after a change adding items which is sent by PurchaseOrderChangeAsyncResponsePullRequest document failing with CIG-PLT-04641 error in the Managed Gateway for Spend&Network portal.

This issue can also be found by looking into the Validator.dat file, which in this scenario contains: The content of element 'urn:item' is not complete. One of '{"urn:Ariba:Buyer:vsap":NumberInCollection, "urn:Ariba:Buyer:vsap":ServiceMapKey, "urn:Ariba:Buyer:vsap":custom}' is expected.

Change, Stuck in Ordering, CIG-PLT-04641 PR Stuck , KBA , BNS-ARI-CI-SCC-BUY , Managed Gateway for Buyer Business Network SCC , Problem