How To Fix CNV_20200_CHECK126 - Conversion of deferred tax table would lead to duplicate table keys

SAP Error Message - Details

• Message type: E = Error

• Message class: CNV_20200_CHECK - Messages for check functions (company code merge)

• Message number: 126

• Message text: Conversion of deferred tax table would lead to duplicate table keys

What causes this issue?

The conversion of the deferred tax table DEFTAX_ITEM would lead to
duplicate table keys.

System Response

Error

How to fix this error?

You cannot run the transformation solution company code merge. We
recommend that you contact SAP for support by creating a ticket using
component CA-LT-CNV.
Please use Report RFUMSV25 (no update mode) before and after the
conversion to compare the results.

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 CNV_20200_CHECK126 - Conversion of deferred tax table would lead to duplicate table keys ?

  The SAP error message CNV_20200_CHECK126 indicates that during the conversion process, there is an issue with the deferred tax table where the conversion would result in duplicate keys. This typically occurs in the context of data migration or system conversion, particularly when moving from one version of SAP to another or when implementing new functionalities that involve tax data.
  Cause:
  The error is caused by the presence of duplicate entries in the deferred tax table that violate the uniqueness constraint of the table's key fields. This can happen due to:
  
  Data Quality Issues: Existing data in the source system may have duplicates that were not identified or cleaned up prior to the conversion.
  Configuration Errors: Incorrect configuration settings in the tax calculation or mapping processes can lead to the generation of duplicate keys.
  Custom Developments: Custom programs or enhancements that manipulate tax data may inadvertently create duplicates.
  
  Solution:
  To resolve this error, you can follow these steps:
  
  
  Identify Duplicates:
  
  Use SQL queries or SAP reporting tools to identify duplicate entries in the deferred tax table. Check for the specific fields that make up the key of the table.
  
  
  
  Data Cleanup:
  
  Once duplicates are identified, you will need to determine the appropriate action to take. This may involve:
  
  Deleting duplicate entries.
  Merging records if they contain different information.
  Correcting any erroneous data that led to duplicates.
  
  
  
  
  
  Review Configuration:
  
  Check the configuration settings related to tax calculations and mappings to ensure they are set up correctly and do not lead to duplicate entries.
  
  
  
  Testing:
  
  After cleaning up the data and adjusting configurations, perform a test conversion to ensure that the error does not reoccur.
  
  
  
  Documentation:
  
  Document the changes made and the rationale behind them to ensure that similar issues can be avoided in the future.
  
  
  
  Related Information:
  
  SAP Notes: Check for any relevant SAP Notes that may provide additional guidance or patches related to this error.
  SAP Community: Engage with the SAP Community forums to see if other users have encountered similar issues and what solutions they have implemented.
  Data Migration Tools: If you are using SAP's data migration tools (like SAP S/4HANA Migration Cockpit), ensure that you are following best practices for data preparation and migration.
  
  By addressing the root cause of the duplicates and ensuring data integrity, you should be able to resolve the CNV_20200_CHECK126 error and proceed with your conversion or migration process.