How To Fix D9746 - Key &1 already exists

SAP Error Message - Details

• Message type: E = Error

• Message class: D9 - Environment Management System

• Message number: 746

• Message text: Key &1 already exists

What causes this issue?

You attempted to create a data record with the key &V1&.
A data record with the logical key that you entered already exists,
although possibly at a time other than on the key date &V2&.

System Response

If there are inconsistencies with regard to the change number and key
date when the data record is being created for the key date, the SAP
System refuses to create the data record.

How to fix this error?

The keys must be unique. Change the existing key or execute the change
with a change number.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message D9746 - Key &1 already exists ?

  The SAP error message D9746 ("Key &1 already exists") typically occurs when you are trying to create or insert a record in a database table or a data structure where a unique key constraint is violated. This means that the key you are trying to use already exists in the system, and the database does not allow duplicate entries for that key.
  Cause:
  
  Duplicate Key Entry: You are attempting to insert a record with a key that already exists in the database.
  Data Migration Issues: If you are migrating data from one system to another, there may be conflicts with existing keys.
  Incorrect Logic in Custom Code: If you have custom ABAP code or enhancements, there may be logic that does not properly check for existing keys before attempting to insert a new record.
  Concurrent Processing: Multiple processes may be trying to insert the same key at the same time.
  
  Solution:
  
  Check Existing Records: Before inserting a new record, check if the key already exists in the database. You can do this by querying the relevant table.
  Modify the Key: If the key must be unique, consider modifying the key value you are trying to insert to ensure it does not conflict with existing records.
  Error Handling in Code: If you are using custom ABAP code, implement error handling to catch this error and handle it gracefully, such as by notifying the user or logging the error.
  Data Cleanup: If this error arises during data migration, ensure that the data being migrated does not contain duplicates.
  Review Concurrent Processes: If multiple processes are trying to insert the same key, consider implementing locking mechanisms or queuing to prevent this from happening.
  
  Related Information:
  
  Transaction Codes: You can use transaction codes like SE11 (Data Dictionary) to check the structure of the table and the unique constraints defined on it.
  Debugging: If you are encountering this error in custom code, you can use the ABAP debugger to step through the code and identify where the duplicate key is being generated.
  SAP Notes: Check SAP Notes for any known issues or patches related to this error message, as there may be specific fixes or recommendations provided by SAP.
  
  If you continue to experience issues, consider reaching out to your SAP Basis or development team for further assistance, as they may have more context on the specific implementation and data involved.