How To Fix SK402 - Transmission error to &

SAP Error Message - Details

• Message type: E = Error

• Message class: SK - SAPcomm messages

• Message number: 402

• Message text: Transmission error to &

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 SK402 - Transmission error to & ?

  The SAP error message SK402, which indicates a "Transmission error to &," typically occurs during the process of sending data or messages from one system to another within the SAP environment. This error can arise in various contexts, such as during IDoc processing, ALE (Application Link Enabling) communication, or when using SAP's messaging services.
  Causes of SK402 Transmission Error
  
  
  Network Issues: Problems with the network connection between the SAP systems can lead to transmission errors. This could be due to firewalls, routing issues, or network outages.
  
  
  Configuration Errors: Incorrect configuration settings in the ALE or IDoc setup can cause transmission failures. This includes incorrect partner profiles, logical system definitions, or port settings.
  
  
  System Availability: The target system may be down or unavailable, leading to transmission errors when attempting to send data.
  
  
  Message Format Issues: If the data being sent does not conform to the expected format or structure, it may result in a transmission error.
  
  
  Authorization Issues: Lack of proper authorizations for the user or system trying to send the data can also lead to transmission errors.
  
  
  Solutions to SK402 Transmission Error
  
  
  Check Network Connectivity: Ensure that there are no network issues between the systems. You can use tools like ping or traceroute to diagnose connectivity problems.
  
  
  Review Configuration Settings:
  
  Verify the partner profiles in transaction WE20.
  Check the logical system settings in transaction SALE.
  Ensure that the ports are correctly configured in transaction WE21.
  
  
  
  System Status: Confirm that the target system is up and running. You can check the system logs or use transaction SM51 to see the status of application servers.
  
  
  Message Format Validation: Ensure that the data being sent adheres to the expected format. You can use transaction WE02 to monitor IDocs and check for any format-related issues.
  
  
  Authorization Checks: Make sure that the user or system has the necessary authorizations to perform the transmission. You can check user roles and authorizations in transaction SU01.
  
  
  Error Logs: Review the error logs for more detailed information about the transmission error. You can use transaction SM21 to check the system log or SLG1 for application logs.
  
  
  Related Information
  
  
  Transaction Codes:
  
  WE02: Display IDocs
  WE20: Partner Profiles
  WE21: Port Definition
  SM21: System Log
  SLG1: Application Log
  SALE: Logical System Configuration
  
  
  
  SAP Notes: Check the SAP Support Portal for any relevant SAP Notes that may address specific issues related to the SK402 error.
  
  
  Documentation: Refer to SAP Help documentation for detailed information on ALE and IDoc processing.
  
  
  If the issue persists after following these steps, it may be beneficial to consult with your SAP Basis team or reach out to SAP support for further assistance.