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

6G120 - Overview

• 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