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ARIBA integration with SAP HCI

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Hello ,

We are trying to integrate our ERP with Ariba using SAP HCI.

However , on testing we are getting the below message :


Inbound processing in endpoint at /po failed with message "SoapFault:faultstring=MustUnderstand headers: [{}Action, {}To] are not understood.; faultcode={}MustUnderstand"


Flow : ERP->HCI->Ariba.

We are using SAP's pre-packaged content for this scenario.

All required certificates of Ariba and HCI tenant are deployed.

Please let me know if you have faced this issue earlier, and if yes what



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