How To Fix DA355 - No entry & in TBATG for field conversion; CNV entry already exists

SAP Error Message - Details

• Message type: E = Error

• Message class: DA - Dictionary: Compare, distribution, timer, instantiation

• Message number: 355

• Message text: No entry & in TBATG for field conversion; CNV entry already exists

What causes this issue?

An entry for a field conversion is required here, a special type of
conversion.

System Response

Writing the entry into the control table TBATG is refused because an
entry already exists for a general standard conversion.

How to fix this error?

No action necessary; the conversion will be performed using the standard
conversion.

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 DA355 - No entry & in TBATG for field conversion; CNV entry already exists ?

  The SAP error message DA355 indicates that there is an issue with field conversion in the context of a specific table (TBATG) during a data migration or conversion process. The error message suggests that there is an attempt to create a new entry in the conversion table, but an entry with the same key already exists.
  Cause:
  
  
  Duplicate Entry: The most common cause of this error is that there is already an existing entry in the conversion table (TBATG) for the specific field conversion you are trying to create. This can happen if the data migration process is being run multiple times without proper cleanup or if there is a misconfiguration in the mapping of the data.
  
  
  Incorrect Mapping: If the mapping of the source and target fields is not set up correctly, it may lead to attempts to create duplicate entries.
  
  
  Data Consistency Issues: If there are inconsistencies in the data being migrated, it may lead to conflicts when trying to create new entries in the conversion table.
  
  
  Solution:
  
  
  Check Existing Entries: Use transaction SE11 or SE16 to check the contents of the TBATG table. Look for existing entries that match the key you are trying to create. If you find a duplicate, you may need to either delete or modify the existing entry.
  
  
  Adjust Mapping: Review the mapping configuration for the data migration. Ensure that the source and target fields are correctly defined and that there are no overlaps that could lead to duplicate entries.
  
  
  Data Cleanup: If the migration process has been run multiple times, consider cleaning up the conversion table before re-running the migration. This may involve deleting old or unnecessary entries.
  
  
  Consult Documentation: Refer to the SAP documentation or notes related to the specific migration or conversion process you are using. There may be specific guidelines or known issues that can help resolve the error.
  
  
  Error Handling: Implement error handling in your migration process to catch and log such errors, allowing for easier troubleshooting in the future.
  
  
  Related Information:
  
  Transaction Codes: Use transaction codes like SE11 (Data Dictionary), SE16 (Data Browser), or SE78 (SAP Archive Link) to investigate the issue further.
  SAP Notes: Check for relevant SAP Notes that may address this specific error or provide additional troubleshooting steps.
  Migration Tools: If you are using a specific migration tool (like SAP S/4HANA Migration Cockpit), refer to the tool's documentation for best practices and troubleshooting tips.
  
  If the issue persists after trying the above solutions, consider reaching out to SAP support or consulting with an SAP expert who can provide more tailored assistance based on your specific system configuration and migration scenario.