How To Fix CNV_DMC_SIN480 - Duplicate record - initial ledger group already exists for this record

SAP Error Message - Details

• Message type: E = Error

• Message class: CNV_DMC_SIN - Messages for s-innovations migration

• Message number: 480

• Message text: Duplicate record - initial ledger group already exists for this record

What causes this issue?

In migration template exist records with same key field combinations but
with different ledger group. One of those records contains an empty
ledger group. Posting to an empty ledger group will already post to all
ledgers automatically. Posting on specific ledger group at same time
will cause duplicate records.

System Response

Records with specific ledger will be skipped in data migration if same
records with empty ledger group are also provided via migration
template. Doing this, duplicate records in the same ledger won't be
posted.

How to fix this error?

Check related records in migration template:
If you want to post the record automatically into all ledgers just keep
the record with empty ledger group. Delete the records with specific
ledger group.
If you want to post only into specific ledger, delete the record with
the empty ledger group.

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_DMC_SIN480 - Duplicate record - initial ledger group already exists for this record ?

  The SAP error message CNV_DMC_SIN480 indicates that there is a duplicate record in the initial ledger group for a specific entry during a data migration or conversion process. This typically occurs when you are trying to load financial data into the system, and the system detects that the same initial ledger group has already been created for the same record.
  Cause:
  
  Duplicate Data: The most common cause of this error is that the data being imported contains duplicate entries for the initial ledger group. This can happen if the source data has been incorrectly prepared or if there are multiple records for the same ledger group in the migration files.
  Incorrect Mapping: If the mapping of the source data to the target structure is not done correctly, it may lead to the creation of duplicate records.
  Data Migration Process: During the data migration process, if the same data is processed multiple times without proper checks, it can lead to duplicates.
  
  Solution:
  
  Check Source Data: Review the source data for duplicates. Ensure that there are no duplicate entries for the initial ledger group in the data you are trying to import.
  Data Cleansing: If duplicates are found, clean the data by removing or consolidating duplicate records before attempting the migration again.
  Adjust Mapping: Verify the mapping of the data fields to ensure that they are correctly aligned with the target structure. Make adjustments as necessary to prevent duplicates.
  Use Unique Identifiers: If applicable, ensure that each record has a unique identifier to prevent duplicates from being created during the migration process.
  Test Migration: Before performing a full migration, conduct a test migration with a smaller dataset to identify any potential issues, including duplicates.
  
  Related Information:
  
  SAP Notes: Check for any relevant SAP Notes or documentation that may provide additional insights or specific instructions related to this error message.
  Data Migration Tools: If you are using SAP Data Migration Cockpit or other tools, refer to their documentation for best practices on data preparation and migration.
  Consult SAP Support: If the issue persists after following the above steps, consider reaching out to SAP Support for further assistance.
  
  By addressing the root cause of the duplicate records and ensuring proper data preparation, you should be able to resolve the CNV_DMC_SIN480 error and successfully complete your data migration.