How To Fix 0T138 - Target system '&1'/target domain '&2' unknown

SAP Error Message - Details

• Message type: E = Error

• Message class: 0T - WBO Configuration Editor / SE06

• Message number: 138

• Message text: Target system '&1'/target domain '&2' unknown

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 0T138 - Target system '&1'/target domain '&2' unknown ?

  The SAP error message 0T138, which states "Target system '&1'/target domain '&2' unknown," typically occurs in the context of SAP system landscape management, particularly when dealing with system connections, transport routes, or system configurations. Here’s a breakdown of the cause, potential solutions, and related information:
  Cause:
  
  Incorrect Configuration: The target system or domain specified in the transport request or configuration is not correctly defined in the SAP system landscape.
  Missing System Entry: The target system may not be registered in the Transport Management System (TMS) or the System Landscape Directory (SLD).
  Typographical Errors: There may be a typo in the system name or domain specified in the transport request or configuration.
  Network Issues: There could be network connectivity issues preventing the source system from recognizing the target system.
  Authorization Issues: The user may not have the necessary authorizations to access the target system.
  
  Solution:
  
  
  Check System Configuration:
  
  Go to the TMS configuration (transaction code STMS).
  Verify that the target system is correctly defined in the transport domain.
  Ensure that the system is included in the transport routes.
  
  
  
  Register the Target System:
  
  If the target system is not listed, you may need to add it to the TMS configuration.
  Use transaction SMLT to check and manage the logical systems.
  
  
  
  Verify System Names:
  
  Double-check the system name and domain specified in the transport request for any typographical errors.
  
  
  
  Check Network Connectivity:
  
  Ensure that there are no network issues preventing communication between the source and target systems.
  Use tools like ping or traceroute to test connectivity.
  
  
  
  Review Authorizations:
  
  Ensure that the user executing the transport has the necessary authorizations to access the target system.
  
  
  
  Consult SAP Notes:
  
  Check the SAP Support Portal for any relevant SAP Notes that may address this specific error message or provide additional troubleshooting steps.
  
  
  
  Related Information:
  
  Transport Management System (TMS): A tool used in SAP to manage the transport of objects between different systems in the landscape.
  System Landscape Directory (SLD): A central repository that contains information about the systems in the SAP landscape.
  Transaction Codes:
  
  STMS: Transport Management System.
  SMLT: Logical System Management.
  SCC4: Client Administration (to check logical system settings).
  
  
  
  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.