How To Fix CNV20200389 - Duplicates for &1: &2

SAP Error Message - Details

• Message type: E = Error

• Message class: CNV20200 - Messages for development class CNV_20200

• Message number: 389

• Message text: Duplicates for &1: &2

What causes this issue?

The given mapping will lead to duplicates.
This means that &V1& will have the same ID.
&V2& is the target object for the following source &V1&:
&V3&
&V4&

System Response

Either error or warning (depending on the scenario)

How to fix this error?

Find out if these duplicate &V1& are really meant to occur and
acceptable from a business perspective. If necessary, change the
mapping and repeat this activity.
If these objects are really meant to be merged, no priority control is
available. This means that the settings of any one of the existing
records will take priority.
In this case, the status of this activity is automatically changed from
'error' to 'warning' when you execute the activity 'Confirm mapping for
company code merge'.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message CNV20200389 - Duplicates for &1: &2 ?

  The SAP error message CNV20200389, which states "Duplicates for &1: &2," typically occurs during data migration or conversion processes, particularly when using SAP's data migration tools. This error indicates that there are duplicate entries in the data being processed, which violates the uniqueness constraints expected by the target system.
  Cause:
  
  
  Duplicate Data: The primary cause of this error is the presence of duplicate records in the source data that you are trying to migrate. This could be due to:
  
  Incorrect data extraction processes.
  Data quality issues in the source system.
  Multiple entries for the same entity (e.g., customer, vendor, material) in the source data.
  
  
  
  Data Mapping Issues: If the mapping of fields from the source to the target system is not correctly defined, it may lead to duplicates being created during the migration process.
  
  
  Configuration Issues: Sometimes, the configuration settings in the migration tool may not be set up to handle duplicates appropriately.
  
  
  Solution:
  
  
  Identify Duplicates: 
  
  Review the source data to identify the duplicate entries. You can use SQL queries or data analysis tools to find duplicates based on the fields indicated in the error message (e.g., &1 and &2).
  
  
  
  Data Cleansing: 
  
  Clean the source data by removing or consolidating duplicate records. This may involve:
  
  Merging records that represent the same entity.
  Deleting unnecessary duplicates.
  
  
  
  
  
  Adjust Mapping: 
  
  Ensure that the mapping of fields from the source to the target system is correctly defined to avoid creating duplicates during the migration.
  
  
  
  Use Migration Tools: 
  
  Utilize SAP's data migration tools effectively, such as the SAP S/4HANA Migration Cockpit or SAP Data Services, which may have built-in functionalities to handle duplicates.
  
  
  
  Testing: 
  
  After making the necessary adjustments, perform a test migration to ensure that the error does not occur again.
  
  
  
  Consult Documentation: 
  
  Refer to SAP documentation or notes related to the specific migration tool you are using for additional guidance on handling duplicates.
  
  
  
  Related Information:
  
  SAP Notes: Check for any relevant SAP Notes that may provide additional insights or solutions related to this error message.
  Data Migration Best Practices: Familiarize yourself with best practices for data migration, including data profiling, cleansing, and validation techniques.
  Community Forums: Engage with SAP community forums or support channels for shared experiences and solutions from other users who may have encountered the same issue.
  
  By following these steps, you should be able to resolve the CNV20200389 error and successfully complete your data migration process.