How To Fix SHTTP029 - No predecessor request exists

SAP Error Message - Details

• Message type: E = Error

• Message class: SHTTP - Messages for Development Class SHTTP

• Message number: 029

• Message text: No predecessor request exists

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 SHTTP029 - No predecessor request exists ?

  The SAP error message SHTTP029: No predecessor request exists typically occurs in the context of SAP's HTTP communication, particularly when dealing with web services or HTTP requests. This error indicates that the system is unable to find a predecessor request that is necessary for processing the current request. Here are some potential causes, solutions, and related information:
  Causes:
  
  Session Management Issues: The error may arise if the session management is not properly configured, leading to the loss of context for the HTTP request.
  Incorrect URL or Endpoint: If the URL or endpoint being accessed does not correspond to a valid service or if it has been changed, the system may not find the expected predecessor request.
  Network Issues: Temporary network issues or interruptions can lead to the loss of request context.
  Configuration Errors: Misconfigurations in the SAP system or the web service settings can lead to this error.
  Timeouts: If a request takes too long to process, it may time out, leading to the inability to find the predecessor request.
  
  Solutions:
  
  Check Session Management: Ensure that session management is correctly configured in your SAP system. This includes checking session timeouts and ensuring that sessions are being maintained properly.
  Verify URL/Endpoint: Double-check the URL or endpoint being accessed to ensure it is correct and that the service is available.
  Network Stability: Investigate any network issues that may be causing interruptions in communication. Ensure that the network is stable and that there are no firewalls or proxies blocking the requests.
  Review Configuration: Look into the configuration settings for the web service or HTTP communication in SAP. Ensure that all necessary parameters are set correctly.
  Increase Timeout Settings: If timeouts are suspected, consider increasing the timeout settings for the HTTP requests to allow for longer processing times.
  Check Logs: Review the SAP application logs (transaction SLG1) for any additional error messages or warnings that may provide more context about the issue.
  
  Related Information:
  
  SAP Notes: Check SAP Notes for any known issues or patches related to this error message. SAP frequently updates its knowledge base with solutions for common problems.
  Documentation: Refer to the official SAP documentation for HTTP communication and web services for best practices and configuration guidelines.
  Community Forums: Engage with SAP community forums or support channels where other users may have encountered similar issues and can provide insights or solutions.
  
  If the problem persists after trying the above solutions, it may be beneficial to contact SAP support for further assistance, providing them with detailed information about the error and the context in which it occurs.