How To Fix CNV_10020492 - Relationship data for &1 &2 is already contained in table &3

SAP Error Message - Details

• Message type: E = Error

• Message class: CNV_10020 - Message class for package 10020

• Message number: 492

• Message text: Relationship data for &1 &2 is already contained in table &3

What causes this issue?

The relationship data for &V1& &V2& is meant to be copied from a
cluster table into a transparent LOR/ROR table. However this data
already exists in table &V3&.

System Response

The data is not copied.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message CNV_10020492 - Relationship data for &1 &2 is already contained in table &3 ?

  The SAP error message CNV_10020492 indicates that there is a duplicate entry in the relationship data for a specific object (denoted by &1 and &2) in the specified table (denoted by &3). This error typically arises during data migration or conversion processes, particularly when using SAP's data migration tools or during system upgrades.
  Cause:
  
  Duplicate Data: The most common cause of this error is that the data being imported or migrated already contains entries that are identical to those already present in the target table. This can happen if the data extraction process did not filter out existing records or if the same data is being processed multiple times.
  Incorrect Mapping: If the mapping of data from the source to the target is not correctly defined, it may lead to attempts to insert duplicate records.
  Data Integrity Issues: There may be underlying data integrity issues in the source system that lead to duplicates being present.
  
  Solution:
  
  Check for Duplicates: Before running the migration or import process, check the source data for duplicates. You can use SQL queries or data analysis tools to identify and remove duplicate records.
  Adjust Mapping: Review the mapping configuration to ensure that it correctly reflects the relationships and does not lead to duplicate entries.
  Data Cleansing: Perform data cleansing on the source data to eliminate duplicates and ensure that only unique records are being migrated.
  Use Update Instead of Insert: If applicable, modify the migration process to update existing records instead of trying to insert them. This can often be done by using an "upsert" operation.
  Consult Documentation: Refer to SAP documentation or notes related to the specific migration tool you are using (e.g., SAP S/4HANA Migration Cockpit, LSMW, etc.) for any specific guidelines or best practices.
  
  Related Information:
  
  Transaction Codes: Depending on the context, you may want to check transaction codes like SE11 (Data Dictionary), SE16 (Data Browser), or the specific migration tool you are using.
  SAP Notes: Search for relevant SAP Notes that may address this specific error or provide additional troubleshooting steps.
  Community Forums: Consider checking SAP Community forums or other user groups for similar issues and solutions shared by other users.
  
  By addressing the root cause of the duplicate entries and ensuring proper data handling during migration, you should be able to resolve the CNV_10020492 error.