How To Fix CNV_10020091 - Data for &1 &2 already exists in table &3

SAP Error Message - Details

• Message type: E = Error

• Message class: CNV_10020 - Message class for package 10020

• Message number: 091

• Message text: Data for &1 &2 already exists in table &3

What causes this issue?

The process for writing data for &V1& &V2& has terminated. Data has
already been stored in object table &V3&.

How to fix this error?

There are the following ways of restarting the process:
Delete the data for &V1& &V2& from object table &V3&, then restart the
filling process.
Create a path parameter for &V1& &V2& (if not already available) and set
the indicator for duplicate entries. Then restart the filling process.
<ZH>Note:</> The first option is preferable particularly if a lot of
data has already been written.
If you choose the second option, the system creates a program that does
the insert with 'ACCEPTING DUPLICATE KEYS'. This can result in
performance issues.
&HINTS&
To delete the data for &V1& &V2& go to the activity <zk>Job Monitor:
Load Determination Data</> (extended view) and click on &V1& &V2&. On
the following screen press the button "Delete object tables" and answer
the question "Execute in background?" with "yes" when expecting a long
runtime.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message CNV_10020091 - Data for &1 &2 already exists in table &3 ?

  The SAP error message CNV_10020091 indicates that there is an attempt to insert or update data in a table where a record with the same key already exists. This error typically arises during data migration or data transfer processes, especially when using SAP's data migration tools or during system conversions.
  Cause:
  
  Duplicate Data: The most common cause is that the data being processed already exists in the target table. This can happen if the data migration process is run multiple times without proper checks for existing records.
  Incorrect Mapping: There may be an issue with the mapping of source data to the target structure, leading to attempts to insert duplicate records.
  Data Integrity Constraints: The target table may have unique constraints that are being violated by the incoming data.
  
  Solution:
  
  Check for Existing Records: Before running the migration or data transfer, check the target table for existing records that match the key of the incoming data. You can use SQL queries to identify duplicates.
  Adjust Data Migration Logic: Modify the data migration logic to handle existing records appropriately. This could involve:
  
  Skipping records that already exist.
  Updating existing records instead of inserting new ones.
  Merging data if applicable.
  
  
  Data Cleansing: Ensure that the source data is cleansed and does not contain duplicates before the migration process.
  Review Mapping Configuration: Verify that the mapping configuration is correct and that it aligns with the target table structure.
  Use Transaction Codes: If applicable, use transaction codes like SE16 or SE11 to analyze the data in the target table and understand the existing records.
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with transaction codes like LTMC (for data migration) or LTMOM (for migration object modeler) if you are using SAP S/4HANA.
  SAP Notes: Check for any relevant SAP Notes that might address this specific error or provide guidance on data migration best practices.
  Documentation: Review SAP documentation related to data migration, especially if you are using tools like SAP Data Services or SAP S/4HANA Migration Cockpit.
  
  By following these steps, you should be able to resolve the CNV_10020091 error and successfully complete your data migration or transfer process.