How To Fix TB519 - Logon system/client and comparison system/client are the identical

TB519 - Overview

• Message type: E = Error

• Message class: TB - SM31 table maintenance messages

• Message number: 519

• Message text: Logon system/client and comparison system/client are the identical

What causes this issue?

You want to compare a view or table.
However, in your choice of RFC connection, the logon system and client
are identical to the comparison system and client. A comparison would
make no sense, since there can be no differences.

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.

TB519 - Details

• The SAP error message TB519 indicates that the logon system/client and the comparison system/client are identical. This typically occurs when you are trying to perform a comparison or a transport operation between two systems or clients that are the same, which is not allowed.
  
  Cause:
  
  Identical Systems/Clients: The most common cause of this error is that the source and target systems or clients you are trying to compare or transport data between are the same. For example, if you are trying to transport changes from client 100 to client 100, the system will throw this error.
  Incorrect Configuration: Sometimes, the configuration settings in the transport management system (TMS) may be incorrectly set, leading to this error.
  
  
  Solution:
  
  Check System/Client Configuration: Ensure that you are selecting different systems or clients for the operation. For example, if you are transporting changes, make sure the source and target clients are different.
  Review Transport Requests: If you are working with