How To Fix DMC_GENERAL156 - An application log has already been saved

SAP Error Message - Details

• Message type: E = Error

• Message class: DMC_GENERAL - MWB: General Messages

• Message number: 156

• Message text: An application log has already been saved

What causes this issue?

An application log already being saved, it is not possible to save
another one to open a third log. It is only allowed to save one first
application log and to work with a second one. Then you are expected to
return to the first log, rather than preceding with a third one.

System Response

An X-message was raised.

How to fix this error?

Change your coding concerning the calls of the log handler methods

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 DMC_GENERAL156 - An application log has already been saved ?

  The SAP error message DMC_GENERAL156 indicates that an application log has already been saved for a particular operation or process. This error typically arises in the context of data management or data migration tasks, particularly when using tools like SAP Data Migration Cockpit (DMC) or SAP Landscape Transformation (SLT).
  Cause:
  
  Duplicate Log Entry: The error usually occurs when there is an attempt to save an application log that has already been recorded for the same transaction or process. This can happen if the same operation is executed multiple times without proper handling of the log entries.
  Process Re-execution: If a process is re-executed without clearing or managing the previous logs, the system may prevent the creation of a new log entry to avoid duplication.
  System Configuration: There may be specific configurations or settings in the SAP system that restrict the creation of multiple logs for the same operation.
  
  Solution:
  
  Check Existing Logs: Before attempting to save a new log, check the existing application logs to see if the log for the operation already exists. You can do this using transaction codes like SLG1 (Application Log) to view logs related to your specific application.
  Clear Previous Logs: If the previous log is no longer needed, you may consider deleting or archiving it, depending on your organization's data retention policies.
  Modify Process Logic: If the error is due to re-execution of a process, consider modifying the logic to handle existing logs appropriately. This may involve checking for existing logs before attempting to create a new one.
  Consult Documentation: Review the SAP documentation related to the specific tool or process you are using (e.g., DMC, SLT) for any guidelines on handling application logs.
  Contact SAP Support: If the issue persists and you cannot determine the cause, consider reaching out to SAP support for assistance. They may provide insights based on the specific context of your implementation.
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with transaction codes like SLG1 (to view application logs) and SLG2 (to manage application logs).
  SAP Notes: Check for any relevant SAP Notes that may address this specific error or provide additional troubleshooting steps.
  System Logs: Review system logs for any additional error messages or warnings that may provide context for the issue.
  
  By following these steps, you should be able to address the DMC_GENERAL156 error and manage application logs effectively in your SAP environment.