Data transmission between SAP PI and Tibco system

Hi Experts,

Business Requirement: 3^rd Party sends PO to us and we need to send back PO Acknowledgement to them.

Technical:

To receive the PO from 3^rd party. We shared the WSDL file after configuration as SOAP Sender Adapter in SAP PI 7.3. We started receiving
the PO’s from 3^rd party.

We needs to send PO acknowledgement with their IDOC Number. So that they shared the WSDL file(generated in TIBCO system) and URL for the same for PO acknowledgement confirmation.  We used SOAP Receiver Adapter.

Issue: They received the PO Acknowlegement from Colgate. But it is throwing error at their end.

3rd Party shared the snapshot of the successful acknowledgement and error acknowledgement of their side.

Please advise on the same. Thanks advance.