How To Fix B2004 - Caution: logical systems of target and source clients are identical

SAP Error Message - Details

• Message type: E = Error

• Message class: B2 - ALE Basis tools messages

• Message number: 004

• Message text: Caution: logical systems of target and source clients are identical

<ZH>Diagnosis</>
The logical system must be unique company wide. It must not be used by
any other system in the ALE system group.
Therefore clients must be uniquely assigned to logical systems, that
is, a client can only be assigned to one logical system at a time.
More than one client can never be assigned to the same logical system.
This is true for both pre-productive systems and productive systems;
the pre-productive system has to be a different logical system than the
productive system.
<ZH>Recommendation</>
Assign a different logical system to the target client or leave the
'Logical system' field for the target client empty.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message B2004 - Caution: logical systems of target and source clients are identical ?

  The SAP error message B2004, which states "Caution: logical systems of target and source clients are identical," typically occurs during data transfer processes, such as when using the SAP ALE (Application Link Enabling) or IDoc (Intermediate Document) framework. This error indicates that the logical system of the source client and the target client are the same, which can lead to data inconsistencies or unintended data overwrites.
  Cause:
  
  Identical Logical Systems: The source and target clients are configured with the same logical system name. This can happen if the same client is being used for both sending and receiving data.
  Configuration Issues: Incorrect configuration in the ALE settings or in the logical system definitions can lead to this error.
  Development or Testing Scenarios: In development or testing environments, it is common to have multiple clients that may inadvertently share the same logical system name.
  
  Solution:
  
  
  Check Logical System Configuration:
  
  Go to transaction BD54 (Maintain Logical System) and verify the logical system names for both the source and target clients.
  Ensure that they are different. If they are the same, you will need to change one of them to a unique name.
  
  
  
  Adjust ALE Settings:
  
  Review the ALE configuration in transaction SALE (ALE Configuration) to ensure that the correct logical systems are assigned for the distribution model.
  Make sure that the distribution model is set up correctly and that the logical systems are appropriately defined.
  
  
  
  Use Different Clients:
  
  If you are testing or developing, consider using different clients for the source and target to avoid this error.
  
  
  
  Transport Requests:
  
  If this error occurs during a transport request, ensure that the transport is being directed to the correct target system and that the logical systems are not identical.
  
  
  
  Consult Documentation:
  
  Refer to SAP documentation or notes related to ALE and IDoc processing for additional guidance on resolving this issue.
  
  
  
  Related Information:
  
  
  Transaction Codes:
  
  BD54: Maintain Logical System
  SALE: ALE Configuration
  WE20: Partner Profiles
  WE21: Port Definition
  
  
  
  SAP Notes: Check for any relevant SAP Notes that may address specific scenarios or bugs related to this error.
  
  
  Testing: After making changes, perform a test to ensure that the data transfer works as expected without triggering the B2004 error.
  
  
  By following these steps, you should be able to resolve the B2004 error and ensure that your data transfer processes function correctly.