How To Fix CNV20201451 - Only changed numbers are logged

SAP Error Message - Details

• Message type: E = Error

• Message class: CNV20201 -

• Message number: 451

• Message text: Only changed numbers are logged

All renumberings are logged.
However only the documents that get a new document number are listed in
the log.
If the document number does not change, no entry is written to the log
table!
You can find the log for a test run in table CNV_20201_TRACKT and the
log for the update run in table CNV_20201_TRACK.
Renumbering here means renumbering of document numbers or other number
range objects.

What causes this issue?

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

System Response

How to fix this error?

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message CNV20201451 - Only changed numbers are logged ?

  The SAP error message CNV20201451, which states "Only changed numbers are logged," typically occurs in the context of data migration or data transformation processes, particularly when using SAP's data migration tools or during the execution of certain programs that involve number ranges or number assignments.
  Cause:
  This error message usually indicates that the system is configured to log only changes to number ranges or number assignments, and no changes were detected during the operation you were attempting to perform. This can happen in scenarios where:
  
  No Changes Made: The operation you executed did not result in any changes to the data, hence there is nothing to log.
  Configuration Settings: The logging settings in the system may be configured to log only changes, which means if the data remains the same, no log entry will be created.
  Data Migration Process: During data migration, if the source data is identical to the target data, the system will not log any changes.
  
  Solution:
  To resolve this issue, consider the following steps:
  
  Verify Data Changes: Ensure that the data you are trying to migrate or transform has indeed changed. If the source and target data are the same, there will be no changes to log.
  Check Configuration: Review the logging configuration settings in your SAP system. If you need to log all operations regardless of whether changes were made, you may need to adjust these settings.
  Review Migration Process: If you are using a specific migration tool or program, check the documentation to ensure that you are following the correct procedures and that the tool is functioning as expected.
  Consult SAP Notes: Look for any relevant SAP Notes or documentation that may address this specific error message. SAP frequently updates its knowledge base with solutions to common issues.
  Testing: If possible, perform a test run with a small set of data to see if the issue persists. This can help isolate whether the problem is with the data itself or the process being used.
  
  Related Information:
  
  SAP Data Migration Tools: Familiarize yourself with the tools and methodologies used for data migration in SAP, such as the SAP Data Services, SAP S/4HANA Migration Cockpit, or LSMW (Legacy System Migration Workbench).
  Logging Mechanisms: Understand how logging works in your SAP environment, including transaction logs, change logs, and how they can be configured.
  SAP Community and Forums: Engage with the SAP Community or forums where other users may have encountered similar issues. They can provide insights or solutions based on their experiences.
  
  If the problem persists after trying the above solutions, consider reaching out to your SAP support team or consulting with an SAP expert for further assistance.