How To Fix TN818 - Internal error: No semaphore/PAT10 entry exists

SAP Error Message - Details

• Message type: E = Error

• Message class: TN - Support Package Manager (SPAM) Messages

• Message number: 818

• Message text: Internal error: No semaphore/PAT10 entry 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.

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Smart SAP Assistant

• What is the cause and solution for SAP error message TN818 - Internal error: No semaphore/PAT10 entry exists ?

  The SAP error message TN818, which states "Internal error: No semaphore/PAT10 entry exists," typically indicates an issue related to the SAP transport management system (TMS) or the transport directory. This error can occur when the system is unable to find the necessary semaphore or PAT10 entry, which is essential for managing transport requests.
  Causes:
  
  Transport Directory Issues: The transport directory may be corrupted or not properly configured.
  Missing Entries: The semaphore or PAT10 entries may be missing from the transport directory.
  System Configuration: There may be issues with the configuration of the transport management system.
  Database Issues: Problems with the database or inconsistencies in the transport tables can lead to this error.
  Transport Layer Problems: Issues with the transport layer configuration can also cause this error.
  
  Solutions:
  
  
  Check Transport Directory:
  
  Verify that the transport directory is correctly set up and accessible. The transport directory is usually located in the file system under the path defined in the TMS configuration.
  Ensure that the directory has the correct permissions and is not corrupted.
  
  
  
  Recreate Semaphore Entries:
  
  If the semaphore or PAT10 entries are missing, you may need to recreate them. This can often be done by restarting the transport management system or the SAP system itself.
  
  
  
  TMS Configuration:
  
  Review the TMS configuration settings. You can do this by using transaction code STMS and checking the configuration for the transport routes and layers.
  Ensure that all systems in the transport domain are correctly configured and connected.
  
  
  
  Check Transport Logs:
  
  Look at the transport logs for any additional error messages or warnings that could provide more context about the issue.
  
  
  
  Database Consistency Check:
  
  Perform a consistency check on the transport tables in the database. You can use transaction codes like SE11 to check the relevant tables.
  
  
  
  SAP Notes:
  
  Check the SAP Support Portal for any relevant SAP Notes that address this specific error. There may be patches or updates available that can resolve the issue.
  
  
  
  Contact SAP Support:
  
  If the issue persists after trying the above solutions, consider reaching out to SAP Support for further assistance. They can provide more specific guidance based on your system configuration and logs.
  
  
  
  Related Information:
  
  
  Transaction Codes: 
  
  STMS: Transport Management System
  SE11: Data Dictionary (to check table structures)
  SE37: Function Module (to check function modules related to transport)
  
  
  
  Transport Directory Structure: Familiarize yourself with the structure of the transport directory, which typically includes directories like cofiles, data, and log.
  
  
  SAP Community: Engage with the SAP Community forums where other users may have encountered similar issues and can share their solutions.
  
  
  By following these steps, you should be able to diagnose and resolve the TN818 error in your SAP system.