How To Fix XT023 - System &1 already registered in domain

SAP Error Message - Details

• Message type: E = Error

• Message class: XT - Transport Management System

• Message number: 023

• Message text: System &1 already registered in domain

What causes this issue?

A system <LS>&V1&</> is already registered in the domain controller of
the transport domain <LS>&V2&</>. Two systems with the same system
names cannot be administered in one domain.

System Response

You cannot include the system in domain <LS>&V2&</>.

How to fix this error?

Use transaction STMS to display the systems which are already
registered (STMS -> Overview -> Systems) at the domain controller.
Delete system <LS>&V1&</> from the transport domain and repeat the
logon in system <LS>&V1&</> if you want to register the new system
<LS>&V1&</> in the transport domain <LS>&V2&</>.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message XT023 - System &1 already registered in domain ?

  The SAP error message XT023 "System &1 already registered in domain" typically occurs when there is an attempt to register a system in the SAP Landscape Management (LaMa) or SAP Solution Manager that is already registered in the domain. This can happen due to various reasons, such as duplicate registrations or issues with the system's configuration.
  Cause:
  
  Duplicate Registration: The system you are trying to register is already registered in the SAP domain.
  Configuration Issues: There may be inconsistencies in the system configuration or domain settings.
  Network Issues: Problems with network connectivity or DNS resolution can lead to miscommunication about the system's registration status.
  Manual Changes: Manual changes in the system configuration or domain settings may have led to the system being registered multiple times.
  
  Solution:
  
  
  Check Existing Registrations:
  
  Use the SAP Landscape Management or Solution Manager to check if the system is already registered. You can do this by navigating to the relevant section in the tool and looking for the system in question.
  
  
  
  Remove Duplicate Registration:
  
  If you find that the system is indeed registered, you may need to remove the duplicate entry. This can usually be done through the management tool you are using (LaMa or Solution Manager).
  
  
  
  Verify Configuration:
  
  Ensure that the system configuration is correct and that there are no inconsistencies. Check the system's SID, instance number, and other relevant parameters.
  
  
  
  Check Network Settings:
  
  Verify that the network settings are correct and that there are no issues with DNS resolution. Ensure that the system can communicate properly with the domain controller.
  
  
  
  Consult Documentation:
  
  Refer to the official SAP documentation for Landscape Management or Solution Manager for specific instructions on managing system registrations.
  
  
  
  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 detailed troubleshooting steps based on your specific environment.
  
  
  
  Related Information:
  
  SAP Notes: Check for any relevant SAP Notes that may address this specific error message or provide additional troubleshooting steps.
  SAP Community: Engage with the SAP Community forums to see if other users have encountered similar issues and what solutions they found effective.
  System Logs: Review system logs for any additional error messages or warnings that may provide more context about the issue.
  
  By following these steps, you should be able to resolve the XT023 error and successfully manage your system registrations in the SAP domain.