3812882 - Posting Error: "Posting Failed. 636(F5): The trading partner entered in account XXXX XXXX is not valid"

It's important to understand that a posting failure could occur not only due to Concur configuration but also due to the SAP configuration, therefore troubleshooting is required to understand where the issue may be. 

Before creating a support ticket with SAP Concur:

• Reach out to your system administrators and check your system configurations on both the SAP and Concur side.
• The SAP system administrator provides details of the posting error, such as the document type, document ID, SAP System version, etc.
• Verify data coming in JSON to your SAP FI System: How can I verify the data sent from Concur to SAP ICS (JSON file)?

Customer getting posting failure Posting Failed. 636(F5): on the audit trail of the expense report. , KBA , CON-CA-ADM , Administration , CON-INT , Integrations , Problem