How To Fix 6G120 - Define only one development system for the structure

SAP Error Message - Details

• Message type: E = Error

• Message class: 6G - Messages for System Administration Assistant

• Message number: 120

• Message text: Define only one development system for the structure

What causes this issue?

You have entered more than one system as the development system for the
structure of the System Administration Assistant.

System Response

The development system must be unique.

How to fix this error?

Correct your entry, and choose one system as the development system for
the structure.
Generally, this is the current system or the system in which you
configure which systems you want to administrate using the System
Administration Assistant.

Procedure for System Administrators

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message 6G120 - Define only one development system for the structure ?

  The SAP error message 6G120 ("Define only one development system for the structure") typically occurs in the context of SAP Transport Management System (TMS) when there is a configuration issue related to the transport routes or the definition of the development systems in the landscape.
  Cause:
  This error usually arises when:
  
  Multiple Development Systems: The system is configured to recognize more than one development system for a particular transport route or structure, which is not allowed.
  Incorrect TMS Configuration: The Transport Management System (TMS) is not set up correctly, leading to ambiguity in identifying the development system.
  Transport Layer Issues: There may be issues with the transport layer configuration that define how changes are transported between systems.
  
  Solution:
  To resolve the error, you can follow these steps:
  
  
  Check TMS Configuration:
  
  Go to the TMS configuration (Transaction code: STMS).
  Navigate to the Transport Routes and ensure that only one development system is defined for the relevant transport layer.
  
  
  
  Review Transport Layer:
  
  In the TMS configuration, check the transport layer settings.
  Ensure that the transport layer is correctly assigned to the development system and that there are no duplicate entries.
  
  
  
  Adjust System Roles:
  
  Verify the roles assigned to each system in the landscape (Development, Quality Assurance, Production).
  Make sure that the development system is uniquely defined and that no other system is mistakenly set as a development system for the same transport layer.
  
  
  
  Transport Directory:
  
  Check the transport directory settings to ensure that the paths and configurations are correct.
  
  
  
  Consult SAP Notes:
  
  Look for any relevant SAP Notes that might address this specific error or provide additional guidance on TMS configuration.
  
  
  
  Restart TMS:
  
  After making changes, it may be necessary to restart the TMS to ensure that the changes take effect.
  
  
  
  Related Information:
  
  Transaction Codes: 
  
  STMS - Transport Management System
  SE03 - Transport Organizer Tools
  SE09 / SE10 - Transport Requests
  
  
  Documentation: Refer to SAP Help documentation for Transport Management System for detailed guidance on configuring transport routes and layers.
  SAP Community: Check forums and community discussions for similar issues and solutions shared by other SAP users.
  
  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.