How To Fix K5126 - Substitution &1 could not be added to the transport request

SAP Error Message - Details

• Message type: E = Error

• Message class: K5 - CO Reconciliation Ledger

• Message number: 126

• Message text: Substitution &1 could not be added to the transport request

What causes this issue?

In the client, the automatic transport of Customizing objects is
activated.
The settings for the account determination and for the enhanced account
determination were transferred to the respective task &V2& of the
selected transport request.

System Response

For technical reasons, substitution &V1& could not be automatically
transferred to this transport request.

How to fix this error?

Transfer substitution &V1& to a suitable transport request.
In the account determination menu, select "Account determination ->
Transport -> Substitution"
Enter the name of the substitution.
Select the substitution information you want to transport.
Select "Add to request".
As an alternative, you can also process the IMG step
<DS:SIMG.SIMG_CFMENUGCU0GCT0>Transport substitutions</>.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message K5126 - Substitution &1 could not be added to the transport request ?

  The SAP error message K5126, which states "Substitution &1 could not be added to the transport request," typically occurs when there is an issue with adding a substitution rule to a transport request in the SAP system. This can happen for several reasons, and understanding the cause is essential for finding a solution.
  Causes:
  
  Transport Request Issues: The transport request may be locked, or there may be issues with the transport directory.
  Authorization Problems: The user may not have the necessary authorizations to add objects to the transport request.
  Substitution Configuration: There may be inconsistencies or errors in the substitution configuration itself.
  Transport Layer Issues: The transport layer may not be correctly configured, or there may be issues with the transport routes.
  System Status: The system may be in a state that does not allow changes, such as being in a maintenance mode.
  
  Solutions:
  
  Check Transport Request Status: Ensure that the transport request is not locked and is in a modifiable state. You can check this in the Transport Organizer (transaction SE09 or SE10).
  Verify Authorizations: Ensure that the user has the necessary authorizations to add objects to the transport request. This can be checked with the help of your SAP security team.
  Review Substitution Configuration: Check the substitution configuration for any inconsistencies or errors. Make sure that the substitution rules are correctly defined and active.
  Check Transport Layer Configuration: Verify that the transport layer is correctly configured and that there are no issues with the transport routes. You can check this in transaction STMS.
  System Status: Ensure that the system is not in a maintenance mode or any other state that would prevent changes. If it is, you may need to wait until the system is available for changes.
  
  Related Information:
  
  
  Transaction Codes: 
  
  SE09/SE10: Transport Organizer
  STMS: Transport Management System
  SE38: To run reports that may help in diagnosing issues.
  
  
  
  SAP Notes: Check for any relevant SAP Notes that may address this specific error or provide additional troubleshooting steps. You can search for notes in the SAP Support Portal.
  
  
  Logs and Traces: If the issue persists, consider checking system logs (transaction SM21) or short dumps (transaction ST22) for any related errors that could provide more context.
  
  
  If the problem continues after trying the above solutions, it may be beneficial to consult with your SAP Basis team or reach out to SAP support for further assistance.