DSN - Order Enquiry - Failed Status- Bad Request and Error COde "400" in CIG

Dear,

I encounter following fail status when sending out from SAP S/4 HANA an order enquiry (MAHN and/or AUFB output type) to Ariba network. I don't find any relevant document online. Could you please guide me in the right way?

Ariba Network Response is :"Bad Request" and Error Code:"400" and Error Code Response:"Error:Comments has to be included for OSR: 4500001177 Please contact support with the Error Reference Number: ANERR-20000000000000003148641019 for more details. Suggested Action : Document Failed in Ariba Network. Error Code : CIG-PLT-00644. Please review the Support Note 189049 (https://support.ariba.com/item/view/189049) for solution

Thanks in advance.

Cindy