How To Fix CNV20400011 - Temporary duplicates may occur during the conversion

SAP Error Message - Details

• Message type: E = Error

• Message class: CNV20400 - Message class CNV20400

• Message number: 011

• Message text: Temporary duplicates may occur during the conversion

What causes this issue?

The mapping values may result in
<DS:TX.CNV_MBT_TEMP_DUPLICATES>temporary duplicates</>.
Entries of type A -> B and B -> C were found during the analysis. If
during the conversion A is renamed into B before B has been renamed into
C, object B exists twice in the database for a certain period of time
(temporary duplicate), which is not allowed. To avoid this problem, a
special conversion method (with dummy client) must be used. Application
of this method is controlled by the KEYCHVIEWS indicator in table
CNVTABLES. In the given case, the indicator must not be set.

System Response

The program checks if the KEYCHVIEWS indicator is set in table
CNVTABLES, and removes it if it is set.

How to fix this error?

If you add more tables in CNVTABLES, make sure that the KEYCHVIEWS
indicator is not set.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message CNV20400011 - Temporary duplicates may occur during the conversion ?

  The SAP error message CNV20400011 indicates that temporary duplicates may occur during a data conversion process, typically in the context of SAP's data migration tools, such as the SAP S/4HANA Migration Cockpit or other data conversion scenarios. This message is part of the SAP Conversion and Migration framework, which is used to facilitate the transition from legacy systems to SAP S/4HANA or other SAP solutions.
  Cause:
  The error message suggests that during the conversion process, the system has detected potential duplicate entries that could arise due to the way data is being transformed or migrated. This can happen for several reasons, including:
  
  Data Structure Changes: Changes in the data model between the source and target systems may lead to duplicates if the same data is represented differently.
  Data Quality Issues: The source data may contain duplicates that are not resolved before the migration.
  Mapping Issues: Incorrect mapping of fields from the source to the target system can lead to the creation of duplicate records.
  Concurrency Issues: If multiple processes are trying to write to the same target table simultaneously, it may lead to temporary duplicates.
  
  Solution:
  To resolve the issue of temporary duplicates during the conversion, consider the following steps:
  
  
  Data Cleansing: Before migration, ensure that the source data is cleansed to remove any existing duplicates. This may involve deduplication processes or data validation checks.
  
  
  Review Mapping: Check the mapping of fields between the source and target systems to ensure that they are correctly aligned. Make sure that unique keys are properly defined.
  
  
  Adjust Conversion Logic: If you are using custom conversion logic, review it to ensure that it handles potential duplicates appropriately. This may involve adding checks or conditions to prevent duplicates from being created.
  
  
  Use Unique Identifiers: Ensure that unique identifiers (like primary keys) are correctly defined in the target system to prevent duplicates from being accepted.
  
  
  Monitor the Process: If the conversion is being run in a multi-threaded or parallel manner, monitor the process to ensure that it is not causing concurrency issues that lead to duplicates.
  
  
  Consult SAP Notes: Check for any relevant SAP Notes or documentation that may provide additional guidance or patches related to this error message.
  
  
  Related Information:
  
  SAP Documentation: Refer to the official SAP documentation for the specific migration tool you are using, as it may provide additional context and troubleshooting steps.
  SAP Community: Engage with the SAP Community forums to see if other users have encountered similar issues and what solutions they have implemented.
  SAP Support: If the issue persists, consider reaching out to SAP Support for assistance, especially if you have a support contract.
  
  By following these steps, you should be able to address the CNV20400011 error and ensure a smoother data conversion process.