How To Fix DLCN201 - Corresponding entry already exists in table &1

SAP Error Message - Details

• Message type: E = Error

• Message class: DLCN - DELCON : System Messages for DC / Days'Collective Dely Note

• Message number: 201

• Message text: Corresponding entry already exists in table &1

What causes this issue?

You have tried to add an entry in table &V1&, although an entry already
exists with the same key.

System Response

The entry cannot be inserted.

How to fix this error?

Check the data to be inserted into table &V1& (example: incorrect
number allocation). Otherwise contact your system administrator, as
there is probably an internal error.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message DLCN201 - Corresponding entry already exists in table &1 ?

  The SAP error message DLCN201, which states "Corresponding entry already exists in table &1," typically occurs when there is an attempt to create or insert a record in a database table that already has an entry with the same key or unique identifier. This can happen in various scenarios, such as during data uploads, migrations, or when processing transactions.
  Cause:
  
  
  Duplicate Entry: The most common cause is that the system is trying to insert a record that already exists in the specified table. This could be due to:
  
  A previous transaction that was not properly completed.
  Data being uploaded that contains duplicates.
  A program or process that is incorrectly attempting to create a record that already exists.
  
  
  
  Data Consistency Issues: There may be inconsistencies in the data being processed, leading to attempts to create duplicate entries.
  
  
  Configuration Errors: Incorrect configuration settings in the system or in the data import process can lead to this error.
  
  
  Solution:
  
  
  Check for Existing Records: Before attempting to insert a new record, check the table specified in the error message to see if the record already exists. You can do this using transaction codes like SE11 (Data Dictionary) or SE16 (Data Browser).
  
  
  Data Cleanup: If duplicates are found, you may need to clean up the data. This could involve:
  
  Deleting or archiving old records.
  Modifying the data being uploaded to ensure it does not contain duplicates.
  
  
  
  Review Data Upload Process: If the error occurs during a data upload, review the data file or the process being used to ensure that it does not contain duplicate entries.
  
  
  Error Handling in Programs: If this error is generated by a custom program or report, review the logic to ensure that it properly checks for existing records before attempting to create new ones.
  
  
  Consult Documentation: Check SAP notes or documentation related to the specific table and the context in which the error occurs for any additional guidance or known issues.
  
  
  Contact SAP Support: If the issue persists and you cannot identify the cause, consider reaching out to SAP support for assistance.
  
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with transaction codes like SE11 (Data Dictionary), SE16 (Data Browser), and SE37 (Function Module) to investigate the issue further.
  SAP Notes: Search for relevant SAP Notes that may address this specific error or provide additional troubleshooting steps.
  Data Model: Understanding the data model and relationships between tables can help in diagnosing why a duplicate entry is being attempted.
  
  By following these steps, you should be able to identify the cause of the DLCN201 error and implement a solution to resolve it.