How To Fix CNV_DMC_SIN263 - Accounting Data: &1 / &2 already exists

SAP Error Message - Details

• Message type: E = Error

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

• Message number: 263

• Message text: Accounting Data: &1 / &2 already exists

What causes this issue?

Within this migration object you can only extend new accounting data.
You can't change already existing entries.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Delete these records from the template/staging table.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message CNV_DMC_SIN263 - Accounting Data: &1 / &2 already exists ?

  The SAP error message CNV_DMC_SIN263, which states "Accounting Data: &1 / &2 already exists," typically occurs during data migration or conversion processes, particularly when using the SAP Data Migration Cockpit (DMC) or similar tools. This error indicates that the system has detected duplicate accounting data entries that are being processed, which violates the uniqueness constraints of the accounting data in the target system.
  Cause:
  
  
  Duplicate Entries: The most common cause of this error is that the accounting data being imported or migrated already exists in the target system. This could happen if:
  
  The same data is being processed multiple times.
  There are overlapping data sets being migrated from different sources.
  The data extraction process did not filter out existing records properly.
  
  
  
  Incorrect Mapping: If the mapping of source data to target data is not set up correctly, it may lead to attempts to insert records that already exist.
  
  
  Data Integrity Issues: There may be issues with data integrity in the source system, leading to duplicates being extracted.
  
  
  Solution:
  
  
  Check for Duplicates: Before running the migration, check the source data for duplicates. Ensure that the data being migrated does not already exist in the target system.
  
  
  Data Cleansing: Cleanse the data in the source system to remove duplicates. This may involve:
  
  Identifying and merging duplicate records.
  Ensuring that the data extraction process is set to only pull unique records.
  
  
  
  Adjust Migration Logic: Modify the migration logic to handle existing records appropriately. This could involve:
  
  Implementing logic to skip existing records.
  Updating existing records instead of trying to insert them.
  
  
  
  Use of Staging Tables: Consider using staging tables to first load the data and then perform checks for duplicates before moving it to the final target tables.
  
  
  Review Mapping Configuration: Ensure that the mapping configuration in the migration tool is correct and that it aligns with the target system's data structure.
  
  
  Consult Documentation: Refer to SAP documentation or notes related to the specific migration tool you are using for any additional guidance or known issues.
  
  
  Related Information:
  
  SAP Notes: Check for any relevant SAP Notes that may address this specific error or provide additional troubleshooting steps.
  Data Migration Cockpit (DMC): Familiarize yourself with the features and capabilities of the DMC, as it may offer options for handling duplicates.
  Transaction Codes: Use transaction codes like SE16 or SE11 to inspect the relevant database tables for existing records that may be causing the conflict.
  
  By following these steps, you should be able to resolve the CNV_DMC_SIN263 error and successfully complete your data migration process.