How To Fix 6G121 - Only select one system as the master system

SAP Error Message - Details

• Message type: E = Error

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

• Message number: 121

• Message text: Only select one system as the master system

What causes this issue?

You have defined more than one system as the master system for the
System Administration Assistant.

System Response

The master system for the System Administration Assistant is the system
from which you want to centrally administrate other systems.
Independent of this, you can administrate systems in any other system.
The master system is different in that it contains the status
information for all other systems centrally. All the other systems only
have status information about their local systems.
There may only be one master system.

How to fix this error?

Correct your entries and define only one master system.

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 6G121 - Only select one system as the master system ?

  The SAP error message 6G121 ("Only select one system as the master system") typically occurs in the context of system landscape configuration, particularly when dealing with system replication or system landscape management. This error indicates that the system is expecting only one master system to be designated, but multiple systems have been selected or configured incorrectly.
  Cause:
  
  Multiple Master Systems Selected: The most common cause of this error is that the configuration has multiple systems marked as master systems, which is not allowed.
  Incorrect Configuration: There may be a misconfiguration in the system landscape settings, where the system is unable to determine which one should be the master.
  User Error: The user may have inadvertently selected more than one system as the master during the configuration process.
  
  Solution:
  
  Review Configuration: Go to the system landscape configuration settings and review the systems that have been designated as master. Ensure that only one system is marked as the master.
  Deselect Extra Masters: If you find that multiple systems are selected as master, deselect the additional systems, leaving only one designated as the master.
  Check Documentation: Refer to the SAP documentation or guidelines for configuring the system landscape to ensure compliance with best practices.
  Consult with Basis Team: If you are unsure about which system should be the master, consult with your SAP Basis team or system administrator for guidance.
  Testing: After making the necessary changes, test the configuration to ensure that the error no longer appears.
  
  Related Information:
  
  SAP Notes: Check SAP Notes for any specific patches or updates related to this error message.
  System Landscape Directory (SLD): Familiarize yourself with the SLD and its role in managing system landscapes, as it may provide additional insights into configuration issues.
  Documentation: Review SAP Help documentation for system replication and landscape management for detailed instructions on setting up master systems.
  
  If the issue persists after following these steps, it may be beneficial to reach out to SAP support for further assistance.