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

XT023 - Overview

• 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