How To Fix FS864 - Communication error with the external tax system (&)

SAP Error Message - Details

• Message type: E = Error

• Message class: FS - Messages from Tax Routines / Prenumbered Checks

• Message number: 864

• Message text: Communication error with the external tax system (&)

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

Unfortunately, there isn't any extra information in this error notice.

What else can you do?

First, use our AnswerBot below to get a possible cause and solution (requires a premium subscription).

Also, review the in-depth Common Questions & Answers listed below; you could discover a solution there or be able to connect with others who have faced similar challenges.

You can also try searching the SAP support portal (support.sap.com) but you need a special user ID to access it. It is possible that an SAP support note exists that provides additional details about the mistake or even steps for fixing it.

Smart SAP Assistant

• What is the cause and solution for SAP error message FS864 - Communication error with the external tax system (&) ?

  The SAP error message FS864, which indicates a "Communication error with the external tax system," typically arises when there is a failure in the communication between SAP and an external tax calculation system. This can occur in various scenarios, such as during the processing of invoices, tax calculations, or when interfacing with third-party tax software.
  Causes:
  
  Network Issues: Problems with the network connection between SAP and the external tax system can lead to communication errors.
  Configuration Errors: Incorrect configuration settings in the SAP system or the external tax system can prevent successful communication.
  Service Availability: The external tax service may be down or unavailable, leading to communication failures.
  Firewall or Security Settings: Firewalls or security settings may block the communication between the two systems.
  Incorrect API Endpoints: If the API endpoints or URLs used for communication are incorrect, it can result in errors.
  Data Format Issues: If the data being sent to the external tax system is not in the expected format, it may cause a communication error.
  
  Solutions:
  
  Check Network Connectivity: Ensure that there is a stable network connection between the SAP system and the external tax system. You can use tools like ping or traceroute to diagnose connectivity issues.
  Review Configuration Settings: Verify the configuration settings in both SAP and the external tax system. Ensure that all parameters, such as URLs, ports, and authentication details, are correctly set.
  Monitor External Tax System: Check the status of the external tax system to ensure it is operational. If it is down, you may need to wait until it is back online.
  Firewall and Security Settings: Review firewall rules and security settings to ensure that they allow communication between the SAP system and the external tax system.
  Validate API Endpoints: Confirm that the API endpoints being used for communication are correct and accessible.
  Check Data Formats: Ensure that the data being sent to the external tax system adheres to the expected format and structure. Validate the data for any inconsistencies or errors.
  
  Related Information:
  
  SAP Notes: Check SAP Notes for any known issues or patches related to the FS864 error. SAP frequently updates its knowledge base with solutions for common problems.
  Logs and Traces: Review application logs and traces in SAP to gather more information about the error. This can help identify the specific cause of the communication failure.
  Consult Documentation: Refer to the documentation for both SAP and the external tax system for guidance on configuration and troubleshooting.
  Support: If the issue persists, consider reaching out to SAP support or the support team for the external tax system for further assistance.
  
  By following these steps, you should be able to diagnose and resolve the FS864 error effectively.