How To Fix XT661 - You can only update external systems in the controller system

XT661 - Overview

• Message type: E = Error

• Message class: XT - Transport Management System

• Message number: 661

• Message text: You can only update external systems in the controller system

Self-Explanatory Message

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To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

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Smart SAP Assistant

• What is the cause and solution for SAP error message XT661 - You can only update external systems in the controller system ?

  The SAP error message XT661, "You can only update external systems in the controller system," typically occurs in the context of distributed systems or when working with SAP Landscape Management (LaMa) or similar setups where multiple systems are involved. This error indicates that an attempt was made to update an external system from a non-controller system, which is not allowed.
  
  Cause:
  
  System Roles: In a distributed environment, there are designated controller systems that manage updates to external systems. If you attempt to perform an update from a system that is not designated as the controller, you will encounter this error.
  
  Configuration Issues: The system may not be properly configured to recognize which system is the controller, leading to confusion about where updates can be made.
  Authorization Issues: The user may not have the necessary authorizations to perform updates on the external system from the current system.
  
  
  Solution:
  
  Identify the Controller System: Determine which system is designated