3682540 - Why my OC(Order Confirmation) is failing with error "Error:OC-8: Order ID XXXXXX matches multiple purchase orders."?

Why my OC(Order Confirmation) is failing with error BusinessNetwork response is :"Bad Request" and ErrorCode:"400" and ErrorResponse:"Error:OC-8: Order ID XXXXXX matches multiple purchase orders. Please contact support with the Error Reference Number: ANERR-XXXXXXXXXXXXXXXX for more details.. Suggested Action : Document failed in Business Network.ErrorCode:CIG-PLT-00644.Please review the Support Note 189049 (https://support.ariba.com/item/view/189049) for solution in my SAP Integration Suite, Managed Gateway for Spend Management and SAP Business Network? 

error oc-8, order id matches multiple purchase orders, supply chain collaboration, order confirmation,po payloadID , KBA , SBN-AN-SCC-OC , Supply Chain Collaboration - Order Collaboration , Problem