How To Fix 3W111 - Duplicate key. Mark only one entry for each defined key.

SAP Error Message - Details

• Message type: E = Error

• Message class: 3W - HR: Message Class South Africa

• Message number: 111

• Message text: Duplicate key. Mark only one entry for each defined key.

What causes this issue?

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

More than 1 scheme has been proposed .

How to fix this error?

Mark 1 scheme only per defined key.

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 3W111 - Duplicate key. Mark only one entry for each defined key. ?

  The SAP error message 3W111: Duplicate key. Mark only one entry for each defined key typically occurs when there is an attempt to create or modify a record in a database table where a unique key constraint is violated. This means that the system has detected that there are multiple entries with the same key value, which is not allowed.
  Cause:
  
  Duplicate Entries: The most common cause is that there are already existing entries in the database that have the same key values you are trying to enter.
  Incorrect Data Entry: Users may inadvertently enter the same key value multiple times.
  Data Migration Issues: If data has been migrated from another system, it may contain duplicates that violate the unique key constraints.
  Configuration Errors: In some cases, the configuration of the system may allow for duplicate entries when it should not.
  
  Solution:
  
  Check Existing Records: Review the existing records in the database table to identify any duplicates. You can use transaction codes like SE16 or SE11 to view the table data.
  Modify or Delete Duplicates: If duplicates are found, you may need to modify or delete the existing records to ensure that only one entry exists for each key.
  Data Validation: Implement data validation checks in your application to prevent users from entering duplicate keys.
  Review Data Migration: If the issue arose after a data migration, review the migration process to ensure that it correctly handled unique constraints.
  Consult Documentation: Check SAP documentation or consult with your SAP Basis or development team for specific guidance related to the table and keys involved.
  
  Related Information:
  
  Transaction Codes: Use transaction codes like SE16 (Data Browser) or SE11 (Data Dictionary) to investigate the table structure and existing data.
  Unique Key Constraints: Understand the unique key constraints defined in the database table to ensure compliance when entering data.
  SAP Notes: Check SAP Notes for any known issues or patches related to this error message.
  User Training: Provide training to users on how to enter data correctly to avoid duplicates.
  
  By following these steps, you should be able to resolve the 3W111 error and prevent it from occurring in the future.